Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a1d8663e51cc09…

MALICIOUS

PDF

88.0 KB Created: 2021-08-13 18:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 562457b0304c7edcd7cb44faee4495a5 SHA-1: c15ddb10ffc5d24181af9e4e1a5af6391036931e SHA-256: a6a1d8663e51cc09a68b548a7c78e06bd7589c85443d0a0fcff6ff67c2d1ebe6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://wastran.ru/uplcv?utm_term=how+to+connect+my+cricut+explore+air+2+to+my+mac
    • http://tai-yang.tw/taiyang/upload/file/tukifuxoganosirenerur.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/6215ae1509d591b731486c7ef6c29688/56182621622.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160966c3391f90---73103162838.pdf
    • https://bucatariizidite.ro/printuri-fi/files/bifulejuvidususe.pdf
    • https://aimhc.com/userfiles/file/98378369196.pdf
    • http://alhouti.com/userfiles/file/40672582252.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/2be64facc4614ade1fd01ede1cffd976/zawefizulinowevasuvuwo.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16091dfc6abeb7---34861884586.pdf
    • http://merwepizza.com/upload/file/63920308772.pdf
    • http://singlesync.com/userfiles/file/feberiz.pdf
    • https://chilegastronomia.cl/uploads/userfiles/files/82502578323.pdf
    • http://akcjonariusz.com/UserFiles/file/707693282.pdf
    • https://mimpishiodua.com/contents//files/turezolabusejiv.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/c28e36c02e67244789a1acdf061fc174/vefogatu.pdf
    • http://andlupa.com/userfiles/file/69232258893.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895a3648cdc---bevarofu.pdf
    • https://majorsagilekvaros.hu/uploads/file/70101624924.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161124f841d354---jozovegeliku.pdf
    • https://arrayamed.com/userfiles/file/tazeg.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072226b718d3---sepotopi.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/7e30a8b7c083b483b91ffc522c009ab1/misezaliburuwewavugidalum.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160783e5672d34---99183608163.pdf
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/welaxujaladapojulekakevam.pdf
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/6170484804.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_off0000f141.bin
b99dcadb363606472e7de99c392f5d349439a1821eb9c922b968b20e97d56a2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 17888 bytes
font_01_sfnt_off00012030.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12030 16792 bytes
font_02_sfnt_off00013847.bin
1365e29be95644b5d17d2513764644c273a4533d4215c8281e74450144912a6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13847 10880 bytes