Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb741d18f6e965c8…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 14:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6a32c2e3e3e7ec585da8b13555b3188a SHA-1: 143638ebbc3c7de868679b1cc7ab8f1a41232f54 SHA-256: fb741d18f6e965c859e1399ba89bbd73b3ef8f715606658240a46a2899e8915e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. Heuristics reveal it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS uploads. The presence of a 'download button' lure suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious workflow, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://synerhu.ru/uplcv?utm_term=how+to+download+apps+on+a+android+tablet PDF link annotation
    • http://brukikostka.pl/uploads/page/file/47792995606.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109061857095060.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/28865108515.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/kinixatajovamatij.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/49730272649.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/nogiweborifatopopi.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/28158615036.pdfIn PDF document text
    • http://bscartridge.com/pic/71175555073.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/29518055650.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/93370389907.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163087423020.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/73614411254.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/17517232366.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/75402471050.pdfIn PDF document text
    • http://stevis.cz/files/file/nomoverotelerodedotoxub.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/3853182772.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/bafol.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/70335064764.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349245db6b8---zikizezifazi.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/q6f3lhr72sls1cfg53cg5f89lg/15800575624.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/sepopig.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/33889417340.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/1043566218.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161313cef9cd6a---2253819888.pdfIn PDF document text
    • 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_off0000daa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA6 18524 bytes
SHA-256: d1ffcd92a7f4550834ab353b92b35a21797a3f06960c95b9dd442f8e76b1a03c
font_01_sfnt_off00010a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A55 10604 bytes
SHA-256: c5487b97e5408538c384bd3e970af0efb1c8777222aadc72d816ab76b869c0ca
font_02_sfnt_off00012276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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