Malicious PDF — malware analysis report

Static analysis result for SHA-256 f145fb76a05dfb5b…

MALICIOUS

PDF

78.5 KB Created: 2021-07-05 15:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2173891d516690d9f9360ba390347670 SHA-1: 246c2db871601b778dab8a02e342e4b8dd09d7d8 SHA-256: f145fb76a05dfb5b172aa51c76fdff60f9c9dc52624841fbbf573bacffdcf0ee
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs pointing to compromised websites, suggesting a link farm or phishing lure. The 'SE_CALLBACK_LURE' heuristic indicates the document may prompt users to call a phone number, a common tactic in tech support scams or billing fraud schemes. No scripts were extracted, but the presence of numerous malicious URLs and the ML classifier output strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://crewmak.ru/uplcv?utm_term=r+and+r+tire+express PDF link annotation
    • http://sumtinathholidays.com/admin/uploadfiles/file/vuwepotenizolerakapik.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/34709228173.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/56174066893.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/tefafenisexib.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/66034750248.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/5b1dc940122bc8cb323d6184176b098a/vodizenasixon.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/45eee32f4f61abbce04c9d5c7d6d02dc/54340819161.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f7a437e74---bavunajaxavotebezot.pdfIn PDF document text
    • https://isosklo.cz./uploads/jojeduxenukigamuwifuz.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160902511df168---34168910150.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/etc3fskl7qbqsecddiffpqp4l1/juxavosusi.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/27659638595.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/41610216992.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/86533563879.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd74965fdf2---36859269466.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/83bf5a53bc4605c13b132f0f7c3c6e0a/jomokuwi.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/83ufqkcp9itsok0so5d87ckro7/mizulogovis.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/08528b6ad7ba87fbf2eaf06994fc1017/kudefobotakunakepowaz.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160802f0797004---nadifawakakede.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/93414977963.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/48thlq7k99r05fp6p03j1klj8l/gesep.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c86adcc0d71---sipevesarutevukipeb.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d82c2415d0---lirivewonu.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/vokilanubozediga.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/7b98cd4142d9ebb0acfe95eacfddeb94/jerisinajimozikilobudox.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_off0000cd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 17616 bytes
SHA-256: dad7279f8c5f28784f567e573794d38c2df71e95819f0b263ccdd405f19ae354
font_02_sfnt_off000113d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D2 10364 bytes
SHA-256: 9aee7f1b40cd5f0f5793f109ab2d0855feff58baef579d2829eeed8ff0c48ea8

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