Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7d2f2a7355c6b5…

MALICIOUS

PDF

79.4 KB Created: 2021-06-26 05:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1625cfa96f2a6d373acba9c47e5ef277 SHA-1: a2d849f1a15599cb20220a52214860ab523d3ced SHA-256: 5c7d2f2a7355c6b51efba71f3b8d7ebf77f1bc068e96e2fa8384c1c58f2cef12
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to distribute malware or lead to phishing pages. The document body is unreadable, but the heuristics strongly indicate a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://imailbox.nl/images/uploadedimages/file/josil.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tra8uib7r6qh1uj2j0s0mt3vjf/supiki.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/48090496172a36481dec05162fdce429/wofugirilijuxumusun.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfee4e2772d---24050370361.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcc61bb92f---42356633324.pdf
    • https://addsfly.com/userfiles/file/zudorolujovuxizodogo.pdf
    • http://murphysbeads.com/clients/54316/File/11424866133.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4b9b4e6bfd42382b91583e0b23857057/42382345649.pdf
    • http://wksx.top/images/userfiles/file/modexuvanolimavikulevorez.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/1765b0040caa60bb87cff394690e9c69/80025108851.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/r11k9ov6k6jb457hsitj2jiaq6/wiwuduluxoz.pdf
    • http://dyglas.com/userData/board/file/kodimetisamariluvomerovo.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16091c7d368c83---vazugif.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/eglsrf62fbdg2hhr733gvvlqg1/jadizofikeniruwokogi.pdf
    • https://bonacorsi.it/file/58213466767.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/d64702984f28b10c9eb9f4177fa2823d/83201010106.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/8c4a2fb6318e36fc475a65ec69ba908d/48139573898.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/3918650f86b930bf1c28446a84d274b9/zegebewedajemezuga.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5f8de84b9---35481292936.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/808osqmctubb8cojfcifs2o2h1/tezomumoxiwanumugipov.pdf
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/gifotifuzidosenamo.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606d354995be0---73574341982.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/556c74c755dd76f64b9b3be20145024f/suvuxamakajojasox.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/647bfa52c5ce19b5e56d2f2cf71ca4db/33850034287.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8413065a5---fajakomajiwi.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/65b179e4c62178def443e3b6813616d3/49126435188.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/ba7cb2bb01500e30f6c2fabd573b5f04/62388482402.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=only+working+1+day+a+week
    • 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_off0000d509.bin
b5bfd45257ba45a4b36f09c5f3aaa8bfdb79e1c118bce0a9bad1c4aa884939be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 10528 bytes
font_01_sfnt_off0000ecf7.bin
78c800df52bf7b8baf8a251706a64103db187fbdc7286e0f34ddf855cd5ee94a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 16800 bytes
font_02_sfnt_off0001182d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1182D 16792 bytes

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