Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1769751340ddc3…

MALICIOUS

PDF

69.5 KB Created: 2021-05-31 05:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: eadc1682362c5e91972d6ed7e634bc46 SHA-1: ffbc98aecfe7fb1a0b1f543a551b2b0520d4a313 SHA-256: 4f1769751340ddc3fb25b82b902397d5ac0f8aa4538e5ca62ed11a4682076976
174 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains multiple external URIs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the PDF is intended to redirect users to malicious content hosted on external servers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9775

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://allytemp.ru/uplcv?utm_term=stealth+cam+stc-qs12+manual PDF link annotation
    • http://sotel-perm.ru/site/file/nojopasagatatigozolo.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160965129cfdd9---guruwolejopujojogil.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/24bb6fd48b30b35c5f39206da200f3cb/wajimilujelevipapafafe.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a63b918b82d---kewizezixagoludojawi.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/65916744963.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/61356309982.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b41fa55b5d7---todovogimavejigutul.pdfPDF link annotation
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606decffd17ba---29724072171.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/kojezijiwigozidezar.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609725f00d6ab---nagiweduwopuno.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/9a75848f98e218eeff997909adc83028/leposaj.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/67135388151.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607929de6f7f4---99550681570.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/035289968c3ba1f95d8bb9b57fec3ac9/tuluvagareranenij.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/d018e1da045fb01e41a1d14b12490e53/nowakoxulod.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/797e2b74e10e6f9c9b5521c80c8de743/1603143922.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607991c5723ce---16736015776.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/pobipavolofoma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 5388 bytes
SHA-256: d2bec449809f7549e784b51913bdf63c7890fc21f97c1c8fd812035c8cf409a5
font_01_sfnt_off0000f97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 10436 bytes
SHA-256: 9902f38f15f30fc7149027369a4e766f903d0b55e75b5fd65a2d5baae2960848