Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a8de95a7161624…

MALICIOUS

PDF

87.2 KB Created: 2021-06-20 18:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3397fbeec8900a15ace843f5b63a5e5b SHA-1: c524baaed025c4f68b026329840003369b41da91 SHA-256: 62a8de95a716162463d32b7b8c40a2e599500b4de30d66a09b8070cc4bac8a5d
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to various URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URIs and the overall structure point towards an attempt to trick users into downloading further malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://drafthe.ru/uplcv?utm_term=vinnaithandi+varuvaya+full+movie+tamilgun
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a28e8cc2e---ziwozumurekiwulifupibez.pdf
    • http://ankurgroups.com/userfiles/file/25588298729.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/91678d037f2ba81ca00418d52d6bafa2/jezelox.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/c5b6b50033f3c58ed4566a35fca5f56b/56471444751.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787f07c3957---pojuwunupanelam.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9fe2f045a---68876832734.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160821371b352a---rokalafenizimesut.pdf
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/1890d0c1e5da42bb83ad0ac0e62905e9/zuwadateku.pdf
    • https://abeess.com/userfiles/file/rerot.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160792626370de---90928797834.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c48894cef85---jofaxekexodosatosuri.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071901f31cf7---90128982144.pdf
    • http://domholidays.com/userfiles/file/65311295771.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/mn89pj61qtdgkk1peaibfvkp73/97528191459.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160acbce82613f---98434792347.pdf
    • https://dalilak1.com/userfiles/file/40712091392.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL
    • 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_off00010764.bin
f6b597769a004f00c25d0577c9cf2c63375ca5e235bc238a37e8bbd3a415743b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 5272 bytes
font_01_sfnt_off0001193f.bin
3ca81359c07b14b87db9544825e595efdcabd520b68be29f1f82e066f39052c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1193F 10984 bytes
font_02_sfnt_off00013f1d.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1D 16164 bytes