Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ec770d59f20d71…

MALICIOUS

PDF

68.9 KB Created: 2021-09-05 21:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9509692b407408583f77645a626e65fd SHA-1: 7edecacc5d9858295997c55df47a69303ce17787 SHA-256: 82ec770d59f20d71f4655a5016e4e06ea22b82d252a0d5c4de0ef84d0e25ce9f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded action trigger, a common tactic for phishing or malware distribution. Multiple heuristics indicate it's part of a link farm hosted on compromised CMS platforms, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://sattamatkapatti.com/userfiles/file/10004052946.pdf In PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d680ac4e353---sirumutejosi.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/38061848253.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cef23a7bb---42217051741.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/61448846666.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/kurelik.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081359991a74---78231921511.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/gurep.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/mejifebewuzemupusobajo.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/kusakobatekenanagemixom.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/maratodaruwole.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/mitumibado.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/pawitakebobobikupamejo.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/32516250203.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/vegipix.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a800f3f0590---30544174827.pdfIn PDF document text
    • http://mhs69indians.com/clients/864804/File/27973643608.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/38417293010.pdfIn PDF document text
    • http://st03.it/userfiles/files/vilozobesitomu.pdfIn PDF document text
    • http://apvn.info/userfiles/file/gudelozopezufo.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/luwelalawafipe.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e5358fbb9---jaroxirevate.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a9e3b4b8d---73370151311.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092e9e5ef054---34661045792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=6th+grade+spelling+worksheets+printable+freePDF link annotation
    • 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_off0000b10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10C 14364 bytes
SHA-256: b0e76fa003eae614bcc70dfabdcd4703e9ff11053641df023c093d38ff088baa
font_01_sfnt_off0000d47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47E 11168 bytes
SHA-256: 0c91aa839d7d838421cf1cd160407580d9555b2161dd52799f0596589d031a65
font_02_sfnt_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1