Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd6c0b324697525…

MALICIOUS

PDF

90.0 KB Created: 2021-06-26 06:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 030ffcb0e123ece4b6a318ea6876884f SHA-1: 2f6c28a4880e4e6d5e43c339ac12825640d3b1bf SHA-256: 4fd6c0b324697525c46fe39476bbbc7a1e64c02abb23f225171c2a1f37006c83
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or phish users. The presence of multiple external URIs and a link farm structure strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=peer+reference+letter+example PDF link annotation
    • http://extracam.es/app/webroot/arxius/file/kenulavotenexebevegaz.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bdabb916331---velut.pdfIn PDF document text
    • https://badrivishal.com/media/14151665255.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c550eb77001---28193803668.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160984767b8e31---15572635424.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f866e36f6---kafasadexopoketokoji.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/lesobeka.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/75212922362.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/noxedadakivaxekiderosezaj.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/sidopulaz.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8884b18f0---44987950254.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/zijujutirapuse.pdfIn PDF document text
    • http://apvn.info/userfiles/file/jewesewopidunekerog.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/sugoburemeruxagapudezadu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/foo2m7ev0bcp36t9jodgp7dcg6/83752268103.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/ragisobewavetesamevuna.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/31647201721.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aa15c62f506---1495253418.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/47132964337.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/kovos.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/85150408104.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086181d64332---vamimiliz.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/jmnsfd6id9tn391s13bp9qhla2/diweripotasukibisex.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10053 16540 bytes
SHA-256: 32080a5110dd381a48cf80fbfe2d33f2ad54c50d40724517d94a6186ecb64433
font_01_sfnt_off00012b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14358 10364 bytes
SHA-256: 97e163b66cfe2476609b837fefa287266d524ce4419bd70537e7dfe46254bed0

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