Malicious PDF — malware analysis report

Static analysis result for SHA-256 de88431287044f9b…

MALICIOUS

PDF

85.4 KB Created: 2021-08-21 20:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a6244d81d74b020c8a4014fd1e7f1a4d SHA-1: 98e71544d6ffef0cf7a3cc4f860e2b98dbefa344 SHA-256: de88431287044f9b226c33a0858a8152ea24b86c04b56e7174128f83ce5c869d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the heuristic firings strongly indicate a phishing or malware distribution attempt via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/75cce6f1c59533a28c8ba4497c5cced9/tirigutavalu.pdf In PDF document text
    • http://www.armstrongre.com/files/files/pudomefibitalafixure.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/99648732360.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/21421193601.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/bolalomoliwavekugumopate.pdfIn PDF document text
    • https://menu2uplus.com/images/file/widamilovadaro.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09094742de---solipililomexamodupajifon.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/xemosotogevapode.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/pg2cnan4ec2fhlbu4a9n1g5bq2/27636372068.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/menuxenokajafatuval.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/65811223307.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/2a456b94cd7d350511c35359a383c739/65274893712.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607845374ef91---86362346027.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/62786196866.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/18008894322.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/2c37a3763d47f18bf6eb05ddd3d0f617/58082409637.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29b9dfe1b---61151544421.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9adaaa98a9---1076479583.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/gahttnc4ehaf6136pi7b2abn4k/labefexabatisimufo.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/sugufupif.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/xedarujaz.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/xapetezanawulafoluxeropil.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/fubamubogeka.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/db744a4d9f40dc1010510516754d26e7/91242256647.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/fr1g2u362otteio2j282v6teg1/69266795990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=coniugazione+del+verbo+mangiare+in+forma+passivaPDF 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_off0000dee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FA 11140 bytes
SHA-256: ef6d64c4fd7eceead9e4196af709916603209391fc5e793b371ad3cf4613eb5a
font_02_sfnt_off0001109b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109B 21332 bytes
SHA-256: 71e53af24fe33981bf93e4e80a6b92172cb072dfeecceee7b727b67fa5bdfff8