Malicious PDF — malware analysis report

Static analysis result for SHA-256 11853f229116e37e…

MALICIOUS

PDF

80.8 KB Created: 2021-06-30 04:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: caa818ebd804fd3c65e86af6ef91e162 SHA-1: e92ccc1a7ca3cca2d6284947ecbdf55b5d6dd175 SHA-256: 11853f229116e37e1aa8368a8593df9685870f33666292dfe96b7eb2ff6e3f5b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it hosts a link farm on compromised CMS uploads. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is designed to trick the user into calling a phone number, likely for a scam. While no scripts were extracted, the presence of numerous URLs pointing to potentially malicious PDF files indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://aelma.com/sites/default/userfiles/file/13461114870.pdf In PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/f60b27908762c56c5bd81ba53ab1879e/kexuxadiwesudapatosabo.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ae8a55e8f8655dd8dd40fb166e6b425e/valolowiben.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/hppen3g9ienor2o51m1kbpbo4o/womelomatidekawizogonux.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/vowalot.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/73568496672.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608de07355f9f---43018965368.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/fimawubapapajidigaleruj.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/wegewowo.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/5763d699ff5ffa2d9113f65371c7e121/95646738012.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/d2214790af48a41563b0141a762ae6a9/68425870429.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/51f49bf75145454ca1c8a1f2cf0f69a2/marevenitida.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160851c0ae0a89---wewumoxovakafu.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/120c2f859fca4dc32a6c4d50a2dce8c1/gebudupazuremadiririz.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9516df439---zebevuwemozepaw.pdfIn PDF document text
    • http://cpils.com/userfiles/file/94849182109.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/46181899377.pdfIn PDF document text
    • https://argumentua.com/i/file/16117804505.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f67e61d8344a0638c4811896b982043a/89726989793.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/25c5571c78d01f79ec1cb8b66869efbd/nidapesap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tina+turner+simply+the+best+concertPDF link annotation
    • 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_off0000d356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 10956 bytes
SHA-256: d5eb0706380ed937c0873e1b3ace5a9a9bc4ceb33958f1ce77cb5660ab28357b
font_02_sfnt_off00010473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10473 19408 bytes
SHA-256: 036f933a31512ff2bdb57e00154db7a9fd20955fb38b238c3a45fe54f505a4fb

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