Malicious PDF — malware analysis report

Static analysis result for SHA-256 40446f4a5e51f83a…

MALICIOUS

PDF

74.0 KB Created: 2021-08-29 11:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f63ffc414351e6da59863d33e22d2b6e SHA-1: 3764749ebef884afe33685e1d78672ee11f11bdd SHA-256: 40446f4a5e51f83aee0b8cb5e898797de75a884afef8cf8bf164028b1e72ddc6
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as phishing/trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=semicolon+before+therefore PDF link annotation
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf8fe65a9f---98957862670.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/3a336453073adb0caf6ff05c9243df10/86729482682.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/kuguzuxol.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/80190674036.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/verupixuxag.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d7e008e72---pirinumibodurelabofiraxu.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/71502480492.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4aefd4035---72047360656.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/7s5cr43ukfdd02ecqijam8i7p9/37820758774.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ced961a3b---4161762713.pdfIn PDF document text
    • https://themalc.org/files/file/32032675635.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/36417099639.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/vafunetadasu.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/xapaxolewubupulop.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/0a548124e876291cf6629c12905ae5e6/vusevugifukigewafadoz.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/77867310158.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/4dbm8ebbn3dld8kqbrf7klmn9j/kamonodof.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/fiwodavuxilu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac094385390---84752280524.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/13737628144.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/gapas.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/bikir.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/8ce99f444dcdc0f6bddfc7d3a59e7228/domogavafukiwemuxodin.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1e189928127afada00906cfd44bedd03/97466961342.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_off0000bf06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71D 10484 bytes
SHA-256: ccf6840c77eeaa88d232dd81d6f0c9cb7fac054dada184919a51816658bd3a4a
font_02_sfnt_off0000eeb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB4 17364 bytes
SHA-256: 78731a20ca808a6fa867d794e682e393b69682c16d7b17d5410e60a1e6d38492

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