Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8c8112d85192f6…

MALICIOUS

PDF

89.8 KB Created: 2021-09-01 07:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1cb268da968fe724d1810c454873a8d SHA-1: 0e4252b41f120d4693f6202409ee54643044ba95 SHA-256: 2a8c8112d85192f664a5f11e216356a9aee1e499fbcc055243262998746f79eb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c52eeb475---69962457449.pdf In PDF document text
    • http://ahchala.com/img/file/32278221820.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6a58040f1e3aea3e479fd48e711d2a08/88429342630.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612027193e226---gavixafanuromi.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/43013817028.pdfIn PDF document text
    • http://iworking.vn/uploads/files/kilozigepibodenowezira.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/nirebotikakexoguwejeta.pdfIn PDF document text
    • https://groupburuemas2.com/contents//files/21436877082.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/a15m0h8cdnb8qa5qgd14vhop72/pejisigodedepar.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/e5769f2209d00520830e4b76915a550c/29222194954.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161293889e579b---39653325029.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078c9da730f8---fomokepuw.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/tovigedoguzegexupifux.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/61054949616.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc19372c7a---21118340703.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/4aedcf5994a5be044041d46948d54fee/sovufaw.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093f48c01a5d---menebel.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160747b41850f6---80633237969.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/vedijusiwa.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/98904975932.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a739fda01d2853ef966adb6ef085ffd1/93906381710.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/35a8871516a6b172a66c409fae5d1d94/betuneba.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/midepamewofidotinelowijos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ring+of+protection+from+evil+pathfinderPDF 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_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 18068 bytes
SHA-256: a4bf14ccc257228c0857c9a4e4431d1655354b78d977fe24532fc765d31b7c8a
font_01_sfnt_off0001274d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274D 11008 bytes
SHA-256: 7b9eddb666fb339e62cda1fec9f9dcc8db0f0f29b5c91ae645a1c13958e8e822
font_02_sfnt_off0001407f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1