Malicious PDF — malware analysis report

Static analysis result for SHA-256 6346f4e1d972a91a…

MALICIOUS

PDF

84.0 KB Created: 2021-09-03 09:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: be7c94d45943adde866da1f7f8dd4dfa SHA-1: 7e31500e3a32c73cabadb6a1fa0c2791d6572b50 SHA-256: 6346f4e1d972a91a5fcecf295a4abcecd23ebbc4033012bcd84790563ccb45c0
176 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to compromised WordPress upload storage and other unknown domains. The heuristic 'SE_CALLBACK_LURE' suggests a potential callback phishing or tech-support scam pretext, aiming to deceive users into interacting further.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beafb4a6d59---99802420134.pdf In PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/d9c976771b5c4572843a888f25a3f373/44205404004.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943da3e3710---23568269506.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/29073356473.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/170957265497.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c983888c564cdf64fedd489d8e1c2358/2320858961.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5bd633aad---95646527583.pdfIn PDF document text
    • https://ancoraeducacion.com/images/92791460210.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/51037181382.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e56aa49558d---13145633974.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/762c7315a215ed6d17b639aaae63a3b8/ferov.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/varurovawez.pdfIn PDF document text
    • http://sibservis.com/ckfinder/userfiles/files/66512641603.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/44cfb3344b7a6c7378e0aabf985daac7/97029007996.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/b5090e1c03b8abf790bffb1b02d01703/xazusurakidijividoz.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/65fb209f277ed8f19ff120c2dec3117a/68261774499.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900a36680c1---91345482377.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9eb863d86c5efc7c23bceb9b6e39a3ad/64952240636.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/7045770100.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/l0gaomiqgosn906ahgmd2l4rjl/30683620922.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e719d2388a612a84268178eaf9017a0d/kipukakewijox.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a1299433c---67264042932.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/vatilika.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/zidexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=mophie+wireless+charging+base+user+manualPDF 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_off0000e08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 18580 bytes
SHA-256: 68d380bd1302fc1c2b53fc043524e191237c23c6aca2940fca194e2be3e4d486
font_01_sfnt_off000110ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EC 11040 bytes
SHA-256: a374ce52e321519009d035b65e548e44a59e809dda6f621848cbf298e85d107d
font_02_sfnt_off00012a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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