Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06345324be09c75…

MALICIOUS

PDF

97.8 KB Created: 2021-09-20 15:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 71ba39391e1144cbd0a3b7305c243819 SHA-1: 7d108c5fdc0d1c07f52e731420ee27bc6b5bd85d SHA-256: b06345324be09c751c085486a9600d510327c8a05a8316a07bd3de4b2916fe81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The presence of external URIs and link farm heuristics suggests the document's primary purpose is to redirect users to malicious or phishing websites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=cach+pha+bot+chuoi+chien PDF link annotation
    • https://alihuata.com/userfiles/file/6046623260.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/70914022444.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/2de73a8b4849ca138a818d7c35234938/81949132525.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/2103225796.pdfIn PDF document text
    • https://pecintajp.com/contents/files/nebevi.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/56876290476.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614664353578e---80694260540.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/78139655715.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410fa14c688---bevidej.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/97194038451.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/1a34cc80b010855d7c88e3780f828b8c/gumogutiwibe.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142accbeab72---35887812119.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/xanibuxif.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/10322636468.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/13/53284376715.pdfIn PDF document text
    • http://ux-school.ru/files/files/pejukawemevuwizolepapizu.pdfIn PDF document text
    • http://ceroki.com/image/files/mivis.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210908_234900.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/jeguvada.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/33639755068.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/dukavurugiwevexuvamopape.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/10528966996.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/87074455905.pdfIn PDF document text
    • http://emannsltd.com/userfiles/41783486652.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/kelifupenoro.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/78123c73459aac1e3c3dd154b3941ab0/volovuzefajuzaje.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/tagusavexurutekip.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 10428 bytes
SHA-256: f0e8d96fee16128c051d0dbcf318da325198d6d43c9f9dbdb8be7cf4717d8df9
font_01_sfnt_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C63 17500 bytes
SHA-256: 8636dd2907db96e93dc66e52d781d30f5e946b5090e05f2dbf48642abd844199
font_03_sfnt_off0001371b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371B 26344 bytes
SHA-256: 7dd659abd0f93adcf838b9912c179d4637e3cf4545b26fb55e1e8829e333fcc0

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