Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5210f6d4914eaa…

MALICIOUS

PDF

85.9 KB Created: 2021-09-08 10:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d884b92830319d3e7a0868a68f666be1 SHA-1: 6ee5b6350de9a14d5d97bd96ef0a2438973b3729 SHA-256: 3b5210f6d4914eaaccfac7a262434dd5f4bacf0a0f39d4657f1ed995084945b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to phishing or malware download pages. The presence of a URL with 'utm_term=xerox+b210+manual' suggests a potential lure related to product manuals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=xerox+b210+manual PDF link annotation
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8de8ec569f---89318237090.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160798da1c272f---53755218597.pdfIn PDF document text
    • http://protok.pro/upload/files/konexobobejobani.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/nokojajuzad.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b3ac344de81cd29bb2175f48c5e1e282/50079125307.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3d04e7b06---vunonuvemoge.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/3257946673edceb78e88679706daf9f3/93611829661.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/23566423521.pdfIn PDF document text
    • http://brukbet.com/user_images/file/54339180594.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b8b320bce0b3be00a93f7325e6117b62/93096311006.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/wuruwekizinuwususuxiwo.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae9a20539d---88768806468.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/7227e2a65f3b583c6ffdd4a0fca204b5/99269397570.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/ruboli.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/4bc3fb26b71e5a9b3a64e37453315f0a/86733012086.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088645b7a9ea---85492173314.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/venuwax.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/tezivorom.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/49971172415.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/fonuvoma.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/xinixodezolakapavesu.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/9umlr84ldvlu5m7jli44drr486/76020304508.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/19f7d3c658ac74ffd0a0e6563d043f57/fazajafejififafumiber.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/gizabewajizomupen.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_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 18524 bytes
SHA-256: 1b4fed147fc37030dabaed9363d79cee31f41fdb248001f961b96c135873da8a
font_01_sfnt_off00011a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13271 10556 bytes
SHA-256: a18b33645dbf93ff2c56007ee1b096444de95faa364a5136e1a1fd7ff281f193

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