Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4e6f3f5716d9f7…

MALICIOUS

PDF

95.1 KB Created: 2021-07-27 03:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0a4e6b83ab0f1c462251a1c1c223425 SHA-1: 03fcf994272a20cd8d7032518a556028cd73d82c SHA-256: dd4e6f3f5716d9f77d60d9a98939206372b82ef36c6e7bf7f75f8230168a52c6
196 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable hosting sites, a common tactic for distributing malicious payloads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method used to evade initial security scans. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.siposferenc.hu/html/9112082149.pdf
    • http://cokhitienvuong.com/uploads/files/kinenujujojebujivinubag.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093a30450922---zevebodaruperopelubalabaf.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbe201d179---51506484200.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d36bab19721---29988422599.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160722669dcf8f---85421667937.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/sh2odcgof1boelaru4vq531f65/dadede.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95f64a2c3b---90662018207.pdf
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/98461678672.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8553ba904---bipikimujowazonafobim.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a47d4bd5cd---meguganolatoximex.pdf
    • http://afghansolar.com/userfiles/file/5206666452.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de982cbfe7c---pomizakasazosu.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1728bdcf6---rajibuwavisari.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070801d061a5---pununofumarizakewomi.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/dlvmfmn09vi33dr6rt6cqfjsnh/74160844354.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a857bb84e8a---26570431724.pdf
    • https://jokerprod.net/userfiles/file/jutusidukoxi.pdf
    • https://makenie.com/upload/files/65485883346.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608336b5c4b3d---fezefolevorarepi.pdf
    • http://animalscipublisher.com/files/upfiles/file/diremejubixa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=como+hacer+un+archivo+pdf+desde+el+celular
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010af1.bin
4d21cba70408587f0e578253b12fec4d1509b97bc4d60e2f76eae18118ad8dc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 18512 bytes
font_01_sfnt_off00013ac8.bin
97286e15a155b4565a53b06b8263f561e52a65ddf5f44ce5a75e7a6bfef32312
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC8 10984 bytes
font_02_sfnt_off0001541e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1541E 16792 bytes