Malicious PDF — malware analysis report

Static analysis result for SHA-256 825bbd261196987a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 00:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ebcc46f3a8fb4f672943a3cbaac20ccc SHA-1: 59e3004d0fcc77ae81a5394c27f840303f80282b SHA-256: 825bbd261196987a7a1938dd7d80cbe1633c56546ce38f1357925b6e7f441da9
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML detection and ClamAV signature. It contains numerous links, many pointing to compromised WordPress installations and disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://fine-cottage.ru/userfiles/file/kixitixuremumapeni.pdf In PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab41231599b---15250951435.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/58355184791.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/jumetumaf.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/bozamu.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/tufezobasigawuwirasax.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945f900d683---27659397281.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/aa633646bec67722ed8e3b71f51cf206/fojiko.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965b230bce1---60303612573.pdfPDF link annotation
    • http://okmarin.ru/userfiles/file/31375717832.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/nixugosopa.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a673c869d48---mafopavilezoba.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a2db3e2f1---xigara.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/68370114400.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/lukixa.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c2484b6cb93---91424461347.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/rtmokqd3q4jdr4i6ve7luaesa2/585695557.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b98da80b68---63902830599.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/totiw.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/3c50ba175646c8b69c6178629bcddc80/ximirujoxibadi.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081108612c97---94497086519.pdfIn PDF document text
    • http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/petituna.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b339b594999---wemokopelefami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=llewellin+setter+puppies+for+salePDF 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_off0000de71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 18816 bytes
SHA-256: 2c467eedeae7783af81ba420040c883f6e861331bdb4b1248b72ad428df67c14
font_01_sfnt_off00010f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12726 10496 bytes
SHA-256: 0dc5e1c5b835ef9d35a5872fa7e85dbbda3e800d152428d44f25dce0a8bad3b3

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