Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1ebb26bfac8dfa…

MALICIOUS

PDF

76.8 KB Created: 2021-09-03 22:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4ebf816fc64c39be3097ada8871f75c6 SHA-1: ea0f989290b80fa0de3e1d16383820a1ece443d9 SHA-256: 7a1ebb26bfac8dfa9b13b4d6fa1e623be9585f15876d472734a66230c58bf1b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to download sites. The presence of external URIs and a link farm on compromised CMS uploads strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://garglob.ru/uplcv?utm_term=download+ezpdf+reader+pro+apk PDF link annotation
    • http://autoscuolepintozzi.it/userfiles/files/30849868361.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b38ee781d---dodufuwiguborevunug.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982afaa8fa4---fofuvasimuleme.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960bf207ad3---xejurotanabewelenudu.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/57178336443.pdfIn PDF document text
    • http://olympusflights.com/files/files/37020195689.pdfIn PDF document text
    • http://chromoink.com/updates/file/10908415051.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/12dbaf1361cca62ad787a2546ce3ed8d/ruzonowi.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb6ab0a88a---pulubutekokupalike.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607eed6cec77a---mefesafotov.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/d8c8bfa03f96879838b8d3e8875b783d/50804717947.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8f4d67a8259ee813432a51601c5219da/masefudikaforofozupebugi.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103ea910ba50---motiwovusodekibogijevutib.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/47193680997.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3226c28122---paguxezuxujoxigugelanodak.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/nalheb7jnkc96uu2gteu688rr4/21707261494.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/fakojapog.pdfIn PDF document text
    • https://bataretak.com/img/files/file/70570483972.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/5735bc6c90bd886f2c1525603609601a/zajebiroj.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/25649222675.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/tijigesikenunenabagaj.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/lijubuzevosonenudomigepuw.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/zuwozer.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f156c42f51---68879628577.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/98226072664.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100b9e43226a---veburi.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75C 10372 bytes
SHA-256: 20f23bfa63a74ca8fdae65f30992cb26a9cdfa8098e76fc4ac04476dec2e3d18
font_01_sfnt_off0000deff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 17912 bytes
SHA-256: c22f31a4bfd1e5c07366b65502387da2daf6965e205c78e4bae47b2dc2a7376d

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