Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a44762946221f94…

MALICIOUS

PDF

66.6 KB Created: 2021-06-20 03:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 23bf2d24a3b3708b5f9767b862861ce9 SHA-1: cdf62f8173ec3bf66517d663f5a67cc67dee131f SHA-256: 7a44762946221f94f7f016887f38b09a22d3478f91afa38e6605e7d1d7c6f4f2
156 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 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://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/9h8pmc1sc4dpimtga630ofb538/dixiwazugavu.pdf In PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887ac2ca843---12251498971.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/9be475a274cf6a8daa37bef904b398eb/38370875428.pdfIn PDF document text
    • https://activepymes.com/pub/file/67417538580.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/20d53f969dcbbefc1372202cd461c332/febokiruwenabuwufov.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf2ece8d39---25332957110.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/k2e429nlm6ahdindij06gtnm7s/jizotirivosotoladidebive.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b7608544e---27934160925.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/62849107737.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/77mp06oqih5gbc6j9801d2m6s8/28206610519.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/7758284479.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/407d777e7f4b0fcf4ef8c21abb8fb5df/gadedidumenopivikimiri.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/mewarufojuvuxi.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac672a7b4e3---45534519305.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/717a326e6f7482d8e78a71b3d8bc8f5d/51259147190.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160905869ee85d---zerazonifawuborakivex.pdfIn 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/zMnd8XtcwSM/uplcv?utm_term=sims+4+five+nights+at+freddy%2527s+ccPDF link annotation
    • https://rynfox.deviantart.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCD 5788 bytes
SHA-256: 497489703d03bbc9c0feb3e2cfe09eb207213b0ff0db96dc4a225ce4d6a20399
font_01_sfnt_off0000d17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17B 16584 bytes
SHA-256: 3dc3b69e9f856f51d7b961274ce46c8546ce85f9f270607df7e5ad5074dc51cb