Malicious PDF — malware analysis report

Static analysis result for SHA-256 635d03267b336862…

MALICIOUS

PDF

76.9 KB Created: 2021-06-19 03:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2bcac109efa88970204b38c40dbe228f SHA-1: 32d2c8aa5c34b199ed73cb8ef69178c971b021c0 SHA-256: 635d03267b33686245719705aa4429c344e30feb29d45f127b522f33b1d0d83c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/95bc51f130be66b24f2ddab5f05af5af/72381099708.pdf In PDF document text
    • http://novichiha.ru/pic/file/39070264496.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/75672889104.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/56614015683.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160737656b775c---togelukoxulux.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9cd11286f67f9a9b093cd3c3b54d32e1/58716517124.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607892d8993aa---22809764605.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbfb33faf7---rulafe.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/24085367373.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/dafurobe.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/42138547159.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/8417af8e1104dae99913c8290a9fa559/pagobulazeluv.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926ce478453---polanudomirowadozek.pdfPDF link annotation
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097eb3be4a97---60972738476.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be314c6636---86715936867.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/65500480531.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=happy+birthday+wishes+in+tamil+kavithai+smsPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f1a6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF1A6 5540 bytes
SHA-256: 17879eeb449341d17b99de5e0d68b373a72bf9e92596482be84f78e9862a5737
font_00_sfnt_off0000deac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 5616 bytes
SHA-256: 05bcf2eea9229eef67754520cb58619441c4a264f356e0cabe5d80f858672226
font_02_sfnt_off000103a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 10192 bytes
SHA-256: 7dd4125d55ad9e5f1b2011c75382fd3080179fb5a44ce4537e2967b3fc33c6e8