Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1ac6e69d06e8a8…

MALICIOUS

PDF

80.7 KB Created: 2021-07-01 12:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5147d7c3a2f42cc519f65c1badfbef0e SHA-1: 63f853c9ae987cc6780b0f31ca69ce4598d5f034 SHA-256: fb1ac6e69d06e8a80dbca4b2af58abc5b6f1c90892b5f74a6e3d1c07353501d4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, designed to redirect users to malicious PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the link farm structure is a common technique for distributing second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://developmentassociationofnagaland.org/nbloom/fckuploads/file/xomalobusu.pdf
    • http://ibtaker.ps/userfiles/file/jatoxubopuredulaxijupewil.pdf
    • https://chmelo.hu/sites/default/files/file/daboxinuralisatusizevoson.pdf
    • https://pmeds.us/userfiles/file/61645879939.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbf280703d---69258744931.pdf
    • http://macabrey-luthier.fr/data/Files/xirupudapuv.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce76d95310---tixefozikusiwedomit.pdf
    • http://efuturesthai.com/uploads/files/gotugelumexuwirazi.pdf
    • http://monroe74.com/clients/871877/File/43560136225.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/bazinux.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4baf35b387---kirudilimul.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7b99d440c---guleraxaditimorefejide.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c7566ee41---45480031008.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9da1eaf2e58b66e76ef057b69b2cccdd/xajanejinofoxilakaka.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777851550d6---desipuforud.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609054291493c---duwonenixezovusovagores.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/3neffd5be2ihc1cc7u9puotv9p/pamanoxewirepejupobew.pdf
    • https://alibabaoman.com/basefile/alibabaomancom/files/46122034183.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/4fd54bc590bc0038424119751d1b95ba/93053684176.pdf
    • http://cesnek-vysocina.cz/UserFiles/File/92338022134.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609f22b3e411d---wapalozegabemomivif.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/b114682169bb1d66f626e9571efbf871/75006883363.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=valentine%27s+day+word+search+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d68d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD68D 16792 bytes
font_01_sfnt_off0000ee9f.bin
838c5fa4a4b75ab97a5eaa48f2f3cd107703f7b368b213279a9e229b5782ec72
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 17068 bytes
font_02_sfnt_off00011ac6.bin
0b22f77d3798da971cee00ffd3daa45cee6739fee37e90abd2af119225639709
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC6 10920 bytes