Malicious PDF — malware analysis report

Static analysis result for SHA-256 f492ba348f6f57b0…

MALICIOUS

PDF

95.5 KB Created: 2021-06-27 00:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5dd52a93478a4f97aa871930dca684b SHA-1: 3c3fdb811dcbf5ac3ff75e8b5113d6c4337502c7 SHA-256: f492ba348f6f57b0d12182b08f3d1e7a0ca94ca1956a4f78e0e7dbf2f632b2d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://oniceh.ru/uplcv?utm_term=perimeter+of+a+equilateral+triangle+is+equal+to+the+perimeter+of+hexagon
    • http://ufnk.fr/app/webroot/files/file/1881812703.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed7ab40a68---42607346682.pdf
    • http://patroha.hu/file/gubezalolibisuju.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/13d793334e03121867cb6c75acee095e/mubagoterunetige.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fbfd3cd54---41323891141.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/adbce21eecedd724cdaf182724a22d09/99435424599.pdf
    • http://guides2alpes.fr/uploads/file/8438757245.pdf
    • https://amatnieks.com/pictures/image/71601083762.pdf
    • http://ferrocom-spb.ru/userfiles/files/pekenoliveterajif.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0dbbc2c91---5755539766.pdf
    • http://parkhighclassof60.com/clients/871169/File/babafotikazov.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607881939eb02---zotuxekemaretug.pdf
    • http://konsultacjenaukowe.eu/Upload/file/nutuligoxuwilovuve.pdf
    • http://mwflower.com/upimagesfile///megedabetejojeli.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d59cbc3dc1---soxitigoxep.pdf
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/wibadifoke.pdf
    • http://ibtaker.ps/userfiles/file/89526236601.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56e18709d2---rarerowusimiwuxodejot.pdf
    • https://cremyco.com/app/webroot/docs/file/debutus.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/500aa5fa9fca8a881300c757b4cfd175/lezisususakokavonijize.pdf
    • http://alituncer.com/userfiles/file/tomadamuzutisebof.pdf
    • https://musikkursus.dk/userfiles/file/gutuwuxepajefezetutifodej.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/6aabaee7ea97e8c985b096e3b4fafb20/40087685635.pdf
    • http://apcmagon.com/userfiles/rorekulajefotuz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bef.bin
1accd58811400f63eb286a6a54d4d79a7ca8b1fe74dda3f8ccbd55c72a0c463a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEF 19288 bytes
font_01_sfnt_off00013ea2.bin
348bac4848304ce6d1a41efb9ed4811b5c0f78c06231d7dff3e15aa5ef2dd4bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA2 11156 bytes
font_02_sfnt_off00015839.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15839 16792 bytes