Malicious PDF — malware analysis report

Static analysis result for SHA-256 39548c3ebb7cd0d6…

MALICIOUS

PDF

112.0 KB Created: 2021-06-30 23:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: cb061e64ba5ffc186562d1b9e6873764 SHA-1: 6cd3d54ea557d590963a394afff467f964c6730a SHA-256: 39548c3ebb7cd0d6ed646a9ea7b512edec02160c83973d71dc79e290c3245425
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to potentially compromised WordPress sites, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of external URIs and the link farm structure indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9279

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://utuin.net/files/fckeditor/file/fewugusalaw.pdf In PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c88a5477d1---24214669474.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/bepuweson.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/bafuwefu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced04becf0---gudizelurizotilox.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/2b277cd30f6295a4459c99a9f18c6aa4/ravawezojuwin.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/bdb3408f1ef9274c0de6edc6ecc7309f/rezesobutis.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608de9218162e---fepovumozuduxelewanu.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/sb0iapcq4g2tb7q3n5eqmjeqpk/4271920353.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/78240958263.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/37610943134.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/romoverakewa.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ri3u8uccdth9l9grf2u74ga4l1/fifib.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/951851ec16d627b19f7028688e9e8590/lumodapizasixizaki.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e3850a0a8---zekotevokonupedav.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4dead251d---12057899063.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dacaeaabea5---fabetejamokuvapukob.pdfIn PDF document text
    • http://avgdesign.com/userfiles/file/84035521043.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/nolasorisiferozozozajopob.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072b16dac5bd---52732317115.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6396f91a255f184b13120ae7e94ba5c8/govif.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846b2abdd1d---gezabonukajivosiso.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/zevomowupus.pdfIn PDF document text
    • https://ghnservizi.com/file/63722511248.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/nafezobukalezilelixutemit.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/48080541590.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609103bd93f6f---jivatakop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+you+say+good+afternoon+in+chinesePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 11000 bytes
SHA-256: 9a68fef63a3434122dbdd09d011eab809c9844bb82fe27a4827aa348bbe9cbda
font_01_sfnt_off00011f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F68 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_02_sfnt_off00013548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D56 17344 bytes
SHA-256: 3eaf9ba11fb70eb7cf380c16f539bd37bdd200d4ca76b7dd5ce0651820b3f07b
font_04_sfnt_off0001810c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1810C 19504 bytes
SHA-256: 422f8fec8d58a5359c5d3026681f2ade3e7740aef2cd355229228f1211d278bb

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