Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a7d49ed5b6e52a…

MALICIOUS

PDF

84.7 KB Created: 2021-06-30 12:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75e09743d81747824a20681e77e5806f SHA-1: 3f03ec5300a146fc6e02f006848ec6f6919b6a8f SHA-256: f9a7d49ed5b6e52ad94358988798196670b324ca903b84800b2ec0f2a8e936c0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://crewmak.ru/uplcv?utm_term=mechanical+engineering+manuals
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4b5c7257c9cfa052aab58655ad378acf/raxabe.pdf
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/87969225126.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/5fd2bcde639483da2836700f759954b8/58096074247.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3da3396d3---47701636137.pdf
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/60951559356.pdf
    • http://notarbrazda.cz/userfiles/file/90624054474.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/953a4e9e77a72c6fb65b0f46ea6fff24/92246394538.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6013dc746d---57222193196.pdf
    • http://efuturesthai.com/uploads/files/66183920333.pdf
    • http://qlinairnv.be/userfiles/file/pazadilupifuvaperomu.pdf
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/pevutisivovumonew.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607de1b2f3449---sevepovoguzibozipopir.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160c19b874f313---doxakuv.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/d6ccbfe2b88b0129d5bb34ea5b20cd76/80345241548.pdf
    • http://asbazainville.org/userfiles/file/5679224874.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/sp9jn1rcf8tv7h36jsihn9dg34/23441779661.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9f0b7ad5d97549a6dc2b830e3187274f/5315095158.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/a7eced6a96f1a220df67fb8000b7d8e0/16081673707.pdf
    • http://shinies.ru/img/lib/file/95063447914.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b804db3741a---zikotelatumuzo.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5638807fb9---zamupove.pdf
    • https://vnsteeldetailing.com/UserFiles/files/85416530820.pdf
    • http://hzjksj.com/images/upload/File/52797170966.pdf
    • http://greece-ex.com/likepazejeletajumowojon.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_off0000e750.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 16792 bytes
font_01_sfnt_off0000ff62.bin
7668b364204ed5bae5ed78c84061ac66c2e84962e0886b120337620218a8d34c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 17080 bytes
font_02_sfnt_off00012c1f.bin
7ac37173f5d0fb7a392a1547b25ccc7a207cce279f6ea94b14edcab457016c36
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1F 10552 bytes