Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f30da051890636b…

MALICIOUS

PDF

84.6 KB Created: 2021-08-14 02:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ae9c58568028ce487210f89dba5b126 SHA-1: a213cb5571fe2fee847387cd1ad4375d82fab6f2 SHA-256: 6f30da051890636b76e58431acfb71851bcf8edeee923bf2ad39a06d1f6f6574
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded JavaScript, though not directly analyzed for specific actions, is often used in malicious PDFs to facilitate exploits or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://pistant.ru/uplcv?utm_term=ap+calculus+ab+practice+exam+2018+pdf PDF link annotation
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8473c32b85---10815405677.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/vebugedemelewute.pdfIn PDF document text
    • http://clubcrudupsonoma.com/clients/1/14/14cf715f5cd05ddba197ceaa5938d7d5/File/79789269662.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2fd43afff---vumazetetob.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607de1a974e49---41987836800.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161147376edaf4---xotadovi.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/11933178592.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/pumulafexoza.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/97199563653.pdfIn PDF document text
    • http://berrybucs1973.com/clients/3/3a/3a2d6910be1067feaf6dc79f90d505e0/File/rodifitizumofodumu.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a58f73d2dfe---42210113119.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c34e9e47c7e---69756433449.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bda7051d9f5---30022265516.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/vuxafazideforudoxibo.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160816825e7e2b---21736903180.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c42be7335a---36373087886.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/aijg9ubmrerm6a35q2ivm8berj/nusagaravukewekoto.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ear7tlht70ec9mf0g59pak3nt6/xuwalinuvamiwufug.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/4dfc8f549c8f3fe30803c84f28356ccb/lerurawikoxevufijolaxepi.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/vojugirilinuvexinipi.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/fofifebineragor.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/worolixoduzanikeve.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/mafusakevifofowimalavizo.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210616111036.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/guguwifamolu.pdfIn PDF document text
    • http://honda-vo.com/upload/file/18360957961.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/93179c9e7fc6e9b0bc0ce8cc71077b95/75009575394.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_off0000e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 17884 bytes
SHA-256: 07715a9316aba4ce0ba48ef12f923de45ceb70daf0dc7d53589ce4211a59dabc
font_01_sfnt_off0001114e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114E 11384 bytes
SHA-256: fce7278f1cc038678aadd06e3029cc2cc1c79723172c6601054cd1a99f18b5cf
font_02_sfnt_off00012c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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