Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1aa6732f436ddb…

MALICIOUS

PDF

86.0 KB Created: 2021-07-06 08:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b55873cbb1af512449b29666e9cbd60e SHA-1: 1ad119d7185950e26aed250081f6ca9e662cfd05 SHA-256: ac1aa6732f436ddbc77399897e9a4b8684821df7a31d9c00f54d486d8dbc2e9a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, but the presence of link farms and compromised hosting suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=how+to+watch+the+marvel+universe+in+order
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/08ce2bb47cbe1035c273332ffff1bd9e/gabeverixufavowulunuge.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9bf11b2f3c4e9d63acd086cbee9efa3f/24602159083.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/fraq4t57m9661rnl3o46m2lfq6/47552515704.pdf
    • https://carcable-bg.com/uploads/pictures/files/kojumugigadiwazojakew.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/7ira3duo91ps34sd4hq5n056vr/87938943037.pdf
    • http://www.vljainandco.com/userfiles/files/litunolavenalofilot.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083540f31881---66853420586.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf02e704f---38607432318.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a26dd411ff---89760097115.pdf
    • https://gamasteel.net/userfiles/file/vudevuvezalomobube.pdf
    • http://atomleasing.ru/media/File/74388730324.pdf
    • https://deniz-sogutma.org/img/userfiles/file/19766769421.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5237837cc08dc9d2ff201764b0300cfb/fanabomajejanerovabegi.pdf
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/63739519835.pdf
    • https://nikoljski.com/ckfinder/userfiles/files/81463100128.pdf
    • http://amblesidewindermere.ca/fckuploads/images/file/vibaxuliwogulalitonul.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/7d68925d061a662d05d632cf31aa7cf4/88458922937.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bcef0f07ce0---94370835708.pdf
    • http://handbook.hu/upload/page/file/xidasewajuwibetizaxekoxaw.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/34745394ba21cfe4dcd288ea52a8565e/nuperinemusijatoboronu.pdf
    • http://atut-biuro.com/uploaded/file/99058698185.pdf
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/xibegupi.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/74062556308.pdf
    • http://jrmhandling.nl/upload/file/wedemutiregelugibefaxipas.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_off0000ec30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC30 16792 bytes
font_01_sfnt_off00010442.bin
200d95f257815ee8f5a5b7087f0da94bb5c9728a89bb9f0fcf7d9fd076170acc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10442 17760 bytes
font_02_sfnt_off00013217.bin
135263a7d2e98197cb42074404044d292d922c0630b463339daefbf0a8315723
pdf-font-stream PDF embedded font (sfnt) at offset 0x13217 10876 bytes