Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9f9d787e37beb4…

MALICIOUS

PDF

88.8 KB Created: 2021-07-16 22:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e7f2f5a54b86b0676d20fe2d40c38f15 SHA-1: 9a1d66849f1b98415ba2be37a2df3f570042419c SHA-256: 7c9f9d787e37beb4fbfbb6d73e2c56eddcae3304eb8ff76928215cff1fc24dbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself does not contain readable content, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/43efbd2bdb0156886057de8aef66fc53/gamovegutujerarakax.pdf In PDF document text
    • http://pm-ural.com/uploads/files/30134728743.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf416ae576---tuvimebunatopaw.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3571818f9---61456989774.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9a9dbe13---68556517862.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/72302781041.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210628152532_2119684771.pdfIn PDF document text
    • http://garderoba.sk/images/_file/geferazekedusolulabopudo.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/pafoxu.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1d6037a4a90d2436110cd4bbe74c3c80/vozofagagafalojepebuno.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/47669485563.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/86939281467.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71411003ef---31049294142.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/jujemolabitupa.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/rodevewemedojisafatebiri.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a2b1c1702---57750172650.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/kizixagutorexamebobujapox.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea45d8c77---44524750281.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c92aef432d7---rijibabalut.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/supewevivitawevozuwop.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/vu5cvbog2qo9u95kf706jt9q69/gusujidomesarej.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/64960829095.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/16262469445.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43f1a5812a---bonisogivekuzi.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/33738e2b71814082c38ef4ef6ac9dc22/9763561169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=back+of+normal+tonguePDF link annotation
    • 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_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 17000 bytes
SHA-256: 17ff79abdbc1dc0e37ac160f4878a3c95889ee19f54e93788eaf80c15f007dc9
font_02_sfnt_off00013d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D66 10664 bytes
SHA-256: 7962ce0a7ce0401e8d5d35630af0c8a87c2527cf78a4eb89ff832cc7c56d59a8

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