Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a93a60e4b1c5c1f…

MALICIOUS

PDF

82.3 KB Created: 2021-08-22 04:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 17872a9611d7aaf0d8f0f8efa16f0f9c SHA-1: 1f6fe7b7b5fed6419ea336dd696c7e9bcafb3b97 SHA-256: 3a93a60e4b1c5c1f0d3b8c299e2ef3db8a7abc12c6ac2d0602a95856c6228f38
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised websites, specifically targeting WordPress upload directories, which are likely used to host further malicious content. The presence of a link farm and UTM parameters suggests an attempt to manipulate search engine results and lure unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f7f69b8a9---mivikotifusopawiz.pdf In PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bade13c9375---3043379174.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/sulavulojefal.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/7edos5694vc15n3hopi9pdpctm/kelogel.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/cf8143de2f681c18a17ceb779c53e3a8/17943230953.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/bejatajuru.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4ed035bc87c7508aa08b40e7c67f78cf/kevajamabixirivetak.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/916e06a0b021a63e393a61a5fab3e43d/22917374034.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff07d98c9e---repojaganujized.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/2640312718.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/gigaz.pdfIn PDF document text
    • http://manu-transport.com/documents/file/26509168129.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/9757914221.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b69c645be---31020535961.pdfIn PDF document text
    • https://izometal.net/mm/file/fiwajuk.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a91aa601---36040204164.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/79057828591.pdfIn PDF document text
    • https://dineflon.com//files/rigabiz.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/mubojotinutuvuf.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/bt15keo1cmk8041ianja48mkr7/10096331476.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/50748230389.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/jatukugevotaw.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/81869371757.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/40679f546e7c92fe16809ed0fa81a700/64538585302.pdfIn PDF document text
    • https://drsaman.com/files/94397053460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sonic+4+episode+1+free+download+ipadPDF 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_off0000dc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3A 17256 bytes
SHA-256: db7c3ea6730668e993e74fb8b9f548f69c0af8c5195c6a9d08ccdbb828f9d621
font_01_sfnt_off00010991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A8 10808 bytes
SHA-256: c5f6f9680b258b071e7e2c202e8a5f2ca59c2ff31a244112acab4568fc96ff68