Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef5395c2a15c0d3…

MALICIOUS

PDF

93.8 KB Created: 2021-07-17 21:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1388d6286aef1f9655a76d95558cb7fb SHA-1: 526dbf5df854023af3ab93e0f20067f39d43a314 SHA-256: 3ef5395c2a15c0d34596ea91174073504cc373ef425fee714d50c3d0dfcea0f8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS uploads and disposable domains, indicative of a link farm used for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the document structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://ashioke.com/images/library/File/mafipalamalubiluguzatano.pdf In PDF document text
    • http://solmoda.it/userfiles/files/gexegojejofurexoje.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/zimesowuwativ.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/69319368087.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f338e0836e125c7eed0758300e6d5075/nifisaxulonidodufutil.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bce7cd607c3---birevax.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/2g6pkafpudhficghunk7ari16h/vefavebikofenugivub.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/7fd7c2ef75a5376fbadba30a34acfb81/98032937824.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/t4qg9s8125hr4v58iate4lv557/71348352240.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/42e9ba395ebf6fd11f2c340ce403bafc/3239679080.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/17182311234.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/ifradriq2r1lrqhvpi4aneq3r2/46879722579.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/giwefurolulujevel.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/96b8866d1838a8b46ee5cb53842f356e/jolevifud.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c433e13f4---39410990763.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed5fc5d371---datolelumekefowirutuf.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/aa1ge026hrkgfs9rfvimquvv54/73924800452.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/upj616klcqrmnia8eevd7t6r2c/daketaxewopurebebulanot.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745eabd447d---zifeliwigorosexad.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/viwavagomovote.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/vilofidirotobojawaxaru.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a055b54e43---92165328512.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/3123982738.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4e5905394---29653952658.pdfIn PDF document text
    • https://synersys.fr/contenu/file/mabiwifujala.pdfIn PDF document text
    • https://777mto.org/contents//files/94817804726.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/timunanavixawenelimokulom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=dental+pulse+9th+edition+volume+1+pdf+free+downloadPDF 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_off0001077d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F94 11236 bytes
SHA-256: 6318a5097d7f68cede716df4c593d6197e9a17da4aeca1c703325d75107f8760
font_02_sfnt_off000139d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D3 18084 bytes
SHA-256: c46e145c20c3e565d463b2b0938ad70673c37f04842d27ab24f2451b02046b5d