Malicious PDF — malware analysis report

Static analysis result for SHA-256 100753c11dc5d643…

MALICIOUS

PDF

86.3 KB Created: 2021-06-28 16:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 124b1b2302ca0753714b580a61b63f0f SHA-1: 2f263dd6554a83f99d09f0a6bb06ea985211816e SHA-256: 100753c11dc5d6436fb9e3799edf1e7ecb99cc7762567c5999486dea1bd48cf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate effort to create a large number of links for SEO manipulation or to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://inwebjor.ru/uplcv?utm_term=married+at+first+sight+mia+tristan
    • http://zwickerfoto.hu/_user/file/zilariferanulefuja.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/o7jel00me35p6t0tc9p4ltl9r6/gatinuxugimesivapa.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0d34ef0ea---vimudiriwowotarusijakaxov.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/4cl2d1cega52aotil6bj9q96eb/dajulubiwo.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc317eadb3a---meboderufazu.pdf
    • https://clubesolbra.com/uploads/files/71241457603.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c248220ac0d---72334340302.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/aa5730522dae22a593948aa6b8d595c2/mubesu.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/7481edbc82c57117e604545555cb3b93/84311257385.pdf
    • https://ludifrance.fr/userfiles/file/67556969576.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/4tsu462bg8ggmthh5iedraepbb/lufekivej.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde6f03f041---buzeke.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/d0di4hht9nu746gpr8cee4nkc2/vemunoxavugozenupovafej.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d87762ef3688c58b66340813c58422ed/35189909653.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608dab237cd37---15121477221.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/lopugifetiwulaginun.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160859d597fce9---gojunike.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8sp2c9ddrsmqje49bsepqi7he4/vebapefovobopugofabe.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f308c70c1---bebipixujutobuxopiju.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5bc498242---nuxunudewilogupoxuxis.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/12ea34d9a9ed219b2cd7a97b4451f6da/87607501103.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876ae18a6e4---resipovimudutojolupizofi.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/dd1ccc24210f64c4e6f3c85f7c10eaf5/24446709234.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_off0000ecd0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD0 16792 bytes
font_01_sfnt_off000104e2.bin
18266da9665e3efd92eae1732f34f7c96ea70667785db2470e85389f6596cacb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104E2 18020 bytes
font_02_sfnt_off00013405.bin
8fb1a919db05f7a5b62404aff63810d8f663cf2e28adcbafa6dc1fcff1fb31c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13405 10628 bytes

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