Malicious PDF — malware analysis report

Static analysis result for SHA-256 537f7e75bb12c86a…

MALICIOUS

PDF

91.7 KB Created: 2021-07-26 07:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8cde9027c3f171d1fee4f680714d218e SHA-1: 3b7f428cd0e43d662f2344d772f4260175a727b4 SHA-256: 537f7e75bb12c86ae09ee07e5e5af11c19fe5f8906e75eb3e712e3b37d5749ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The file likely serves as a lure, potentially delivered via spearphishing, to exploit users into visiting compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/33de75723b82005b807d7fdd1251d1fc/35858166214.pdf In PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609641d7ec0a3---88829319398.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/6n33i2oifj0adts2nlb313dd3i/86114390096.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/24293795218.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/6dee8816a09ab50891f77dca985ffeb6/86282721726.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/jelavemezoko.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/sepasorinotenanamiwobovo.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b4a50d968---surowutuzudurabemovo.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/puwijopaxekijagevunug.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/b48jvvth19b3nmogj8r3p10jb1/59199538815.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/89650097078.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d95a2a0178b---biwixubesori.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e61429890eb---22296752549.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/cqbn89jvatamdak2gtcq5qnr50/wixuruze.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h5sm1b4vkednqq4uve1v4vq3c7/59256550825.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/096afdb56bfb51fb916fd7ff4119a565/duwugajugujopokopari.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/g5kmjbmvkol88a3vsrun242kcs/lukewazen.pdfIn PDF document text
    • http://allasclub.com/campannas/file/tosawirerorigesovituzono.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ec7e9e8a9---nifizagedufisujidite.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/9fd353d71edc3025f3eb93f2b82c3be6/89699709526.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/102145803260902e5be09dd.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/vititipukerorox.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/11413190037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=download+game+house+party+untuk+androidPDF 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_off0000fbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 11232 bytes
SHA-256: f2c06278cb1c3a4abe35314ee7050f949d34aa52057e247a5be2f38f5e1f344c
font_01_sfnt_off000115e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF9 18692 bytes
SHA-256: 786d9768c2142fa490f784afbc00a148030346dbc4872033092c1a4354609fc7

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