Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22503e941f6ab5d…

MALICIOUS

PDF

73.7 KB Created: 2021-08-28 02:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 286dc012b9908544fad49a6c723d5909 SHA-1: 25689756c18e32656aa4a11f367f909757e4e86b SHA-256: d22503e941f6ab5d384d314e7ebad40500b0cbddab3f7a8904db75c0831909d0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a callback phishing lure. It contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to deceive users into contacting fraudulent entities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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) 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://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/520cdc62e77e83a1b956c969b82ff7c6/fuvikaroka.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7548855c32---vanugato.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/650664897a55d6c47c0f0d22e7ee260b/mewifemofiponuvexudugolev.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7833610886---tiripaje.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075b6821caba---lawukapadag.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/5f5eb2230634ba78c774831b95e88c4b/26432918741.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r85gbag6anqk1ig0qph52e4og0/48288474549.pdf
    • http://xiaohecollege.com/d/files/lurumafokig.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b4a50d968---surowutuzudurabemovo.pdf
    • https://dondepodemosir.com/userfiles/file/37566191290.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec4c25233a---vimenedozelobe.pdf
    • https://festival.bg/fckeditorfiles/file/54330632357.pdf
    • http://star-transform-moscow.ru/uimg/files/gexexowubixumodobufazem.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b070a531460---88899627795.pdf
    • http://danangsculpture.com/uploads/image/files/naxiteberej.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079dcb72e1d1---favomezosikiw.pdf
    • http://judge1960reunion.com/clients/873273/File/ritewikopimuti.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/8e7fe9bdd7018e76a4911859343adb76/fadozariguk.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c4644706a---kajelepopi.pdf
    • https://seikico.net/img-tym/files/82959678327.pdf
    • http://gardenofsound.com/userfiles/files/94423865860.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de5f9c1bc63---81892148182.pdf
    • https://datajournonepal.org/files/ruveriragezunelinad.pdf
    • http://mebco.ru/images/file/fukitatipunoruzesokim.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=student+medical+check+up
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000bf76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF76 16792 bytes
font_01_sfnt_off0000d78d.bin
d140e751cb044fcacf764c6b5f63bc14bbf102c694d80db4434cc0eb6372e7e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD78D 10660 bytes
font_02_sfnt_off0000efc4.bin
245f62979d5669d86522963c9c00e55d06e5ea4cecfba6a8da1dbbe36f99e2cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 16160 bytes