Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef95b5c5ad92af0c…

MALICIOUS

PDF

88.2 KB Created: 2021-07-01 01:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1b4a372600d5b56508d1be6618816cd SHA-1: f756e14236b019de781b45bc18abbdd62b7746c6 SHA-256: ef95b5c5ad92af0c84dfdb9712807472898583a4237d41097cad0dd2473c27d6
164 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links to PDFs hosted on compromised websites, suggesting a phishing or malware distribution campaign. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/82pffa845aj5sgb7eptd21evk2/pomonifako.pdf
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/14284532383.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9df7e5ed6---13023262524.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49762b8240---44435899237.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/ea6893cb7cfed910e4fed8106152bca3/lipadikizokanepuguk.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076a175cd91b---xezevegilivolefeberukujod.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/e97874d485ebdc58c2e43777d732036d/18641624191.pdf
    • http://mlsconsulting.net/cms/files/File/50097079829.pdf
    • http://asirakademi.com/resimler/files/texuvofe.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe9fa36a3---xedavebez.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ubgivrmm73gfc5ani1bdpscaa5/bogamufok.pdf
    • http://goteneplast.se/files/images/file/pezufipudakopogavesudil.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/4dl8to6q763ncjcl8r4dnhhnq4/44975111899.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb52008d84---mowunixuki.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e155a953c2fab7c64245a2f6f1843ca/87235595604.pdf
    • http://norilskgu.ru/userfiles/file/1522056693.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/pjpf37535pvj06jklpkakufqei/60741057822.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b318daab0cd---68758015372.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/jdua4spd69rmf0idq5bqsf1i11/52734073064.pdf
    • https://thinkhigh-tech.com/d/files/75764243101.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a4bff7cd4618d35e017927caca28208a/34810569441.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092a6586262f---rofifanuzodirowix.pdf
    • http://pelesiuvalymas.lt/i/File/8361035510.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/4759d963d30955ee8638cc592f693359/51347280116.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7ce7d7d67---89609307601.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e598cb5db---gowemu.pdf
    • http://www.awakohchang.com/image/upload/File/0083372006.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=exponent+rules+review+worksheet+answers
    • 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_off0000f426.bin
60b6340bac9efb3cad34976e3980cf286ed3099dca838acf82e2a1fe1fc2a0e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 17756 bytes
font_01_sfnt_off0001222e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1222E 16792 bytes
font_02_sfnt_off00013a45.bin
ed61cec159a6855593a02fad03ef43a7dd5997b5e004ca7e69c83f23cbf954fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A45 10776 bytes