Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb8b437d74246b8…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 23:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 29af4f3726772dd17c390b06fa3588d7 SHA-1: 75979c067ada87e21c2d34004cf841cec7f09231 SHA-256: 8fb8b437d74246b8678346b4d7eac173ac345229ccd9c3dc7747802e0c2359e8
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites. The presence of 'utm_term' parameters suggests an attempt to track user engagement with potentially deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://medvor.ru/uplcv?utm_term=whatsapp+plus+apk+para+android PDF link annotation
    • https://hunglivet.com/uploads/files/202109050729427867.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/sijulexepeja.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/43307344699.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/42643502150.pdfIn PDF document text
    • http://receptlap.hu/files/35205441314.pdfIn PDF document text
    • http://santeh.md/img/files/vugit.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210907_44762B6EA6A8FFD6.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/rekogogabufelovu.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/vavudewepasaz.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/dulalefugaveg.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///16515569636.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/dokaraki.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/31109860954.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/15752143971.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/na8dcv58vltiaqqt34ci0h2ba6/58787770654.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/b94c8484994de10823e42218b88dc1e8/xomigadupolezelupa.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137014758e54---18857979602.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/salefof.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/46353655594.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/kevetefilixekexa.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/wadasipo.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/wexupapemowamegi.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd246379f---11643387913.pdfIn PDF document text
    • http://specialcats.nl/media/files/satuwewamokibubom.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8e4tkdc0c06pf397vnouq9omgm/18519521312.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/puxifoxiwikos.pdfIn PDF document text
    • 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_off0000dcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB6 10544 bytes
SHA-256: 13b3879e67b6cf528796d2aa1a4d02ae0679a9f93437936f5eed7a2ec6e930b7
font_01_sfnt_off0000f4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBB 18140 bytes
SHA-256: 417b7f33557d837662b330fc1f41c0ddc966fe0cfed0095a9a29a358521586ac

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