Malicious PDF — malware analysis report

Static analysis result for SHA-256 691afe15f5e885b0…

MALICIOUS

PDF

96.4 KB Created: 2021-06-27 14:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb1dbbbe2d4663bc7533eb24e8ee573a SHA-1: b4ee93d119ba0cd2380a886fd890595748399735 SHA-256: 691afe15f5e885b0d10178f018b478c8ae980beb47c578a3732403fe59a67816
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.d-table.com/wp-content/plugins/super-forms/uploads/php/files/53914bb202e68a5c69d993ad3f6fcefb/regiwobuporokigo.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/c1eb1e3014e4262b531f34d839898f9a/68726457034.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607186f14d334---73259087612.pdf
    • https://gachbinhduong.com/upload/file/fewudagubora.pdf
    • http://ackerviewguesthouse.com/userfiles/file/jenegom.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/6ba86c40726188ce3c5e765f98d11020/vuxefer.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3b0948b14---wapapaza.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29123cd0ab---96743417745.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074db4bcebb4---kufuzi.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a397808400---51683438672.pdf
    • http://caratow.nl/userfiles/file/13732060583.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/0f2509b81b3dce8307267b5a62681483/jepevitiwidabusefepuni.pdf
    • https://gastrotest.co/ckfinder/userfiles/files/62120282643.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095aa5998e2c---taruxur.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ed1d569c94e984492e8752a10a5625a/35625770138.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088792691eae---3310098854.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/7ed2310da11256bcdb520a03866e2aec/givaketutafu.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/1d097d55f99e0f28892e39ba24c40353/24649040016.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/892lapv9svo98699n1q86k78ov/wekuwazipexoxezidadej.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe664f37f---pevisubedodin.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/q9pjus31ca1iu7rad57t6opg6g/53081202185.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/1a75fba77e762249a490a6e038fb3798/regenemejozawajodizibo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=connotative+words+definition
    • 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_off000115ac.bin
7dde57a871d5e1cdad77236016d13e13f27bfd8e46c9b29c90e746aa8bd3ab3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115AC 10484 bytes
font_01_sfnt_off00012dc4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC4 16792 bytes
font_02_sfnt_off000145d6.bin
38414d6413725fd64334afdcaba03b8396dccef4e7a75c99e0638fd282a221ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145D6 17304 bytes

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