Malicious PDF — malware analysis report

Static analysis result for SHA-256 a063103bdf20ca89…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 08:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 72a7aa273553b4c153f3df6aadadc5bd SHA-1: 99eb7b318589741b3d5a2b8175c1f28428235da4 SHA-256: a063103bdf20ca898ad61c3e8108621ea65cd092afcc2b95d21cee11bf453a07
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to obscure the true malicious destination. The 'SE_CALLBACK_LURE' heuristic indicates the document prompts the user to call a phone number, a common tactic in tech-support scams or callback phishing. Although no scripts were explicitly extracted, the presence of PDF link farms and the callback lure strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3376

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 http://wonderful-foods.net/userfiles/file/30980215603.pdf In PDF document text
    • https://soechi.net/userfiles/file/jurunofamufaj.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qkpjj3m9a9g1n0chksuj9356ca/42451976421.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/dazulumugaxejowifud.pdfIn PDF document text
    • http://attlas.center/userfiles/file/32115046388.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/44882560357.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/76365194474.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/43620917967.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e0312010d---kudomiletez.pdfIn PDF document text
    • http://chamdure.com/DATA/files/xufigijam.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/989e076cd4585e3f207c9e157ee15fd8/kawekokuta.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eec46bf709---59690771947.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/18776104776.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/leraredu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/nf7fm1mbhljqt1d5boavqtg347/31639901839.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f35974d4f4---84779468171.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/avde1mee03soudi14agtjoufa4/nigigojapoxaxozozepapoji.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a30a75955---27216646585.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210813204710.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/57880434687.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaea526a51---mofakulugiwi.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/m3jf5709ippu2btngk03cjjlc3/fexokipowizokuwub.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b948febca66---98149385289.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d78442c3eeccbf79c90d78e82c51582f/gomiwiw.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/54543544149.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/nefiwebevaduwasuxu.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eb3054359---73828022162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=200+mil+in+inchesPDF link annotation
    • 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_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDD 10160 bytes
SHA-256: cf8897798edc3db73ca6759e7bf56fc0a8bba2bbea2520e0b5c987458ccaf5d2
font_02_sfnt_off00011351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11351 16148 bytes
SHA-256: f3b9de525b4e680f45a9faf30fa2ae58d1d79ea2fcce130945fc9f6298bf7788

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