Malicious PDF — malware analysis report

Static analysis result for SHA-256 011d37329bd8476f…

MALICIOUS

PDF

86.4 KB Created: 2021-06-27 17:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ea2f22fe8b49f2203f4eed4aa2464d4 SHA-1: 60f9ace8e8657b220afac9736090a61178882b99 SHA-256: 011d37329bd8476f68b9e04eaf15173e91986a246d7c939f99202a3d0f9c3b7b
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, some of which are identified as compromised WordPress uploads or disposable hosting. 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, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://hzjksj.com/images/upload/File/68593127435.pdf
    • https://vegan-eshop.cz/data/file/wenasuxavifotosux.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607827ad3f2b8---11656774772.pdf
    • http://gancza.pl/userfiles/file/mevuwukune.pdf
    • https://belhasasecurity.com/userfiles/file/8824157077.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/73de47a26bf88fe031180fc7e8b8a97e/sapavogepizi.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ktca7unji6kvdl7b88gvj4768f/87047062534.pdf
    • http://wedding-ideas.ru/ckfinder/userfiles/files/zoguzipemopozominese.pdf
    • http://www.alcera.ca/userfiles/file/64061733452.pdf
    • https://asiarsolutions.com/userfiles/file/faruj.pdf
    • http://www.aadhar-interior.com/userfiles/file/49504907708.pdf
    • http://steelbo.com/uploads/admins/u0/files/20210609220133.pdf
    • https://narimasu-chintai.net/jcfiles/file/8379333613.pdf
    • http://tanriovermensucat.com/uploads/genel/files/pezunalefefe.pdf
    • http://www.contal-farmer.com/uploads/files/24309143849.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/usarrqsl0kk2a57o6o8gruqs9q/jomovetopitipisobanor.pdf
    • https://deniz-sogutma.org/img/userfiles/file/45294641992.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66c49ab73b---munukovisumenumazinukago.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/23977569029.pdf
    • http://omonetach.pl/foto/ilustracje/file/sufemim.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fec7cd5c5b---58248214927.pdf
    • http://tokyoto.pl/UserFiles/file/53344828009.pdf
    • https://alarrabnews.com/images/content/content/file/jilogem.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3b8b36f502d1cf78bae58a477c58a37d/8159348329.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072896a87ed4---moxafutobenibu.pdf
    • http://ceskylakros.cz/userfiles/file/naxizonovuseluluxasoga.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=rocky+the+musical
    • 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_off0000eed0.bin
daa508aca3cd09af27470ee0ce814e6a62ee113ec925fe0c731312b136512c89
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 17272 bytes
font_01_sfnt_off00011bdb.bin
3ec41712d5b13689431a92ee099394aad634e0ee2683bc7b8b8c797610a1fe57
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDB 10644 bytes
font_02_sfnt_off00013456.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13456 16792 bytes