Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56e5c002d181449…

MALICIOUS

PDF

89.7 KB Created: 2021-07-31 06:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e578a2474f2bf396e7fa3f48e317c2f8 SHA-1: 1c1636a81cca44214d551526b5cf1702edebdedf SHA-256: c56e5c002d181449a58fcd3be751d40f07f4011c64b841cb352d184bf5a3b6df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links are likely used to redirect users to phishing pages or to distribute further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://nomylo.ru/uplcv?utm_term=black+and+decker+cordless+string+trimmer+manual PDF link annotation
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/usrg65dbdctu7t6a02d9sve536/92506959339.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988c517c8c0---28912455551.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/jogijozijipe.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/jvor6rakqaqfl3n7470p99ecvc/watufesozusoxuba.pdfIn PDF document text
    • http://hillandcunnreunion.com/clients/864369/File/64758059340.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/23976001278.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210521155216193.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c223b522439---xumemisunalemifev.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/dizaxipu.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609505ff2b05e---jiserabamegu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ba68b602ec93602c4291efff6d6e84d3/rizujukapawadiwomuwegub.pdfIn PDF document text
    • https://tipresentoio.it/images/file/mijolovuzubuxepavavesupe.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/mobikesusaligoximuxasi.pdfIn PDF document text
    • https://artenika.pl/fck/file/dotafodajabisizal.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/geposikaj.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/nipuparukux.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/36566db69fcd61e8d47aa4860c7387b8/zatodemezidozumofa.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/kezikaxixo.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/ecdbe5d535735fbea032cd89c64a8b2b/39812874720.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/botusujaxu.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/61058771109.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_off0000f6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 17528 bytes
SHA-256: 4cbe7de24a870e1d3295dd71b6a57ad06b128b1dee3e5c05ab64e0ec1b4e28c7
font_01_sfnt_off000124f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F0 10960 bytes
SHA-256: 21af5f1e71199b4783ce79b26fbc2ed4f877c243174d1141b83fd907e5f73782
font_02_sfnt_off00013e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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