Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc7d3cb3bbc03b7…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 07:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dbe9fb0c4360587b342a69a353e4f73f SHA-1: 4205d679d6288f7156402429a7769f868de17e68 SHA-256: abc7d3cb3bbc03b7344ee5ca528b7cf0d3bfab1df49902e164b96dadceadf15b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis confirm the document's role in directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pixomot.ru/uplcv?utm_term=idiom+actions+speak+louder+than+words PDF link annotation
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/b4af7341c2e7361f4a16a47acf7207d3/wamalijider.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/duduzigenomafunepuma.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/pirigasen.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/97053789301.pdfIn PDF document text
    • https://actor-conseil.com/files/file/6568956628.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d814512d15d04d0f9a0eff465c3d956a/regizimasoz.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/db1962e466cf8710dc796ac2c74dca4e/resunivapumevo.pdfIn PDF document text
    • http://whatdwellswithin.com/file/61995903606.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/7168022818.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608860d3f1233---tovomodarigawelep.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/k23ic97pdidj45nd9ojipjlhb3/70404863224.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc0b11686f---20468174876.pdfIn PDF document text
    • http://vtaky.sk/media/file/58812337523.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/48038297209.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7b2620ea4---zebekupiwon.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/66004580734.pdfIn PDF document text
    • http://temple.mo/userfiles/file/81212707229.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611132e3cc1fa---ronabelef.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd223b1bd5f---8168741390.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/f0d29a4e62c876592726320e07eb806b/57834107412.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fab85b84b42---moxupugutaxukixi.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16285716283826.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f50dd197a6b---10683009921.pdfIn PDF document text
    • https://mangallagn.com/images/file/ravowawuzubitosinig.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/64254629517.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_off0000d809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 11008 bytes
SHA-256: 949970f690bd4cbdb7b15d8259d8afb915e74f20368de4384f31af7fec72b944
font_01_sfnt_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 17432 bytes
SHA-256: 960fd48f71d2bc9ea497ab4b541746bad75f14e6c72de33d45d7f33920c7aa2e
font_02_sfnt_off00011e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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