Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a408d3eecd6b79b…

MALICIOUS

PDF

77.6 KB Created: 2021-07-30 04:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7eeaaea110fcfe803da3e69abda77c9a SHA-1: 86ca0dcf1f9aec53780b400b8320c57ac53824b4 SHA-256: 7a408d3eecd6b79b77ea2c99342e7ea2798dceff835d892513e1b1e61628951c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. This behavior is indicative of a link farm or a phishing lure, designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://archism.ru/uplcv?utm_term=literary+devices+in+macbeth+act+5+scene+5 PDF link annotation
    • http://iscyber.com/userfiles/files/zezimefukaxigaferup.pdfIn PDF document text
    • https://genegurumiraclehealer.comuserfiles/file/poripobitil.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160856cf43226a---jefazudi.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/sleqbt4cke4oelc2sqfu3nfn9g/jofomeleteg.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/vulisaseroga.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/eens2u5ph3ctbt0oc3445vi9cr/10074490319.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e659dd57949---ditesuzotatapawerudusurab.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/fbea9d93cccd589964cfc40f1f6ba3d5/29082950768.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a954e6d4a3c---16848572223.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/84547158482.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/2000814081.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/29181a9647f7d0c9c01876686cae3c7f/93462334301.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607390c454de6---kidasikasewafagekimibe.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/80062225616.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964da45793b---wezulopugowotiz.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/9db717d74ffa72741f2aa6680e77eb79/selakixevazilarovederad.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/laninubukukube.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/93776946159.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/5ee16e7ccd513debcf00d3a3e1a62c1e/biveziruxitusebutubasituf.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fc42aa47abd---38223831641.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/1cfbb180aba10f5ca67cc4e0f5ef88b9/rugukudo.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/14791723229.pdfIn PDF document text
    • http://ipceurope.com/assets/file/70111432666.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_off0000cc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2D 15960 bytes
SHA-256: c13f787bcc68f4399aadc2f3bb614cee734c4998ca6561ed12c3b1590665109b
font_01_sfnt_off0000f4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 10880 bytes
SHA-256: 26b1ca569a798ccf4b36384ab20d025443090e11ca528c73daa47d1744358a9b
font_02_sfnt_off00010dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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