Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c3d0baf24921de…

MALICIOUS

PDF

91.0 KB Created: 2021-08-10 20:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd89b3fe8b4a689af54176713db62318 SHA-1: 628dcb509204bfa020b541e8af55ba1eb2549d2c SHA-256: 11c3d0baf24921ded8657b23b2810e9f2d4a93cbc4f7f230696cbd1b3c80e0ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate this file is likely part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/207fd92b0c8e9f8323ba41cf150574f1/75424475931.pdf
    • http://smartickgroup.com/userfiles/kipuraxu.pdf
    • https://globalcareerclub.com/FCKeditor/userfiles/file/wofokinore.pdf
    • http://statewideroofservices.com/clients/b/b8/b825a24af54c157c196cf52173d75bf0/File/41211459273.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/6kjrd6b1tcjg58hrv6v2v87hmg/2141369396.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/64016677982.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/e02f0526b4413fe82556928ec453be7f/49044967501.pdf
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/37836748305.pdf
    • https://ceral.pl/ceral/pliki/file/12453579113.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f61dc05b7---69174590370.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/4339d9ba8d373dbf7c664cb029d66e1f/tawokorazuke.pdf
    • http://buyyoutubelikes.com/ci/userfiles/files/vufutilujujejaxelefekewiz.pdf
    • http://aranykoronakft.hu/userfiles/file/xidexo.pdf
    • https://xlspandoek.nl/userfiles/file/relore.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723dd168465---74824379031.pdf
    • https://senfina.top/uploads/files/verixeruliromi.pdf
    • http://baohanhranghm.com/upload/img/files/redowuvev.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a83f30abe32---napire.pdf
    • http://e-district.org/userfiles/file/87366658074.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160eca406f1d63---gejogedorikolif.pdf
    • http://wsp.pl/userfiles/file/xojunasubogadezo.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b113982337eb98ff487b26f030b9903b/bonajezajak.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=keyboard+course+for+beginners+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_off0000fcbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 16792 bytes
font_01_sfnt_off000114d2.bin
771b815169637580d0a18f3e1cebd0b53bd78d063d92c84a2ac50bbcf2e7055c
pdf-font-stream PDF embedded font (sfnt) at offset 0x114D2 10996 bytes
font_02_sfnt_off00012e0d.bin
128ff79e7a2e3e876274f182317c14e67e02e84c28219feb11620b5f69b912e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0D 18092 bytes