Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1dc745599a454e6…

MALICIOUS

PDF

85.1 KB Created: 2021-08-18 02:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6c6ad89ae38f9c1bfb12311d8eebaacb SHA-1: bb6d78871afebb27ec8f2f43f9d2d6c871bf5de2 SHA-256: f1dc745599a454e6a0a95633b27731633b8bf107108207e2473386ae57288a93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, hosting numerous URLs that point to potentially compromised websites or disposable hosting, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a campaign to distribute malicious content through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/7gqok8u2lllaa4bs8n1d0ageuk/61577556584.pdf In PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/patotej.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210809135908.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/lonir.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/kipedodezurinukol.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e8f49e2a8fe00a0f18fd988b2ead7bd8/1383855075.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/detiwiparidiniwadiva.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21409571396.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87921449b8---pekarudop.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e872426119---47084217443.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/94443134531.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/9886f45b5128da3ba06e943f9fd8fce2/23283693120.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092eebd64c06---tovulefuzosidimatinome.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e11fcf4e0d7a62446cf1d335f3f6dba7/zinusijafadovaxunid.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/fbe5e881fb2089ae5d9eba22de09089d/zoniminizojojig.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/xenuf.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05278c88a7---rusikemonoxerovilo.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/97821872114.pdfIn PDF document text
    • http://hanifeugur.com/image/files/7897525964.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/27429305048.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092453403402---fujutopozamat.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/pabufo.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16070323e7f94c---75265536653.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/fuwanidibukisako.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e39a8434e---43760799668.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b62e5e758e2c87e5323115974f81da5f/26831041170.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/44e957b451ea6acdf1c66671b3608ef3/30279631990.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/9903a3da270cd5b36c8c076e6ec1d5cc/33010594650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=update+android+7.0+oppo+a57PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 19396 bytes
SHA-256: 14ecf919f306f5a75d6730b8051286a09eb3adcb2b9ee95d0ce63ca21b988f31
font_01_sfnt_off0001152d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D44 10552 bytes
SHA-256: d7dd224ffc3c6bfa31c9b7fbee9c29cad61907a88c393fbcb8137974c6796685