Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca57361b9770d1b1…

MALICIOUS

PDF

86.3 KB Created: 2021-09-07 13:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4d6671a6966dde3673ee8e5be3103887 SHA-1: d194ba5ab6fa31761daba20ac7173c33af0d641c SHA-256: ca57361b9770d1b1fed2297c6605b48ae2da943c390fa92927b97cd41ea365ec
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 Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://drafthe.ru/uplcv?utm_term=tat+thematic+apperception+test+pdf PDF link annotation
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607428158c669---donavave.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1629755060_add81e1950.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/21151517981.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/pikinokulow.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68a5b3d6a5---26343128208.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e68d6822a---difetel.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607197f4ea377---xakifalefipusim.pdfIn PDF document text
    • http://aimic.com/userfiles/file/lewipobemajuruwomuseleje.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/gubekumoxowavagevoxebopa.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/nogim.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/famava.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/lisageno.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210901091554.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/98fb988ebd6d994087f29693f30e5faf/60429120075.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/nojejojagamifeleda.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/pubezamerobivovenowutafud.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaadbd4951---46953178321.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/83163783944.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/79226745436.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/43faf58f90b4dc8866f8f95e3301f129/vevetazirufosinu.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/53922781000.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/73593402731.pdfIn PDF document text
    • 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_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10504 10800 bytes
SHA-256: 2affa7854d8b6c5e0f0b738f3e0816c9aa4fd4ed4a978ff44c0837ae9ec28160
font_02_sfnt_off00011db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB2 17784 bytes
SHA-256: 9a894a91085b4a0e3fae860753692fec347ff292e5fadf2a66d280e88aeac5a0

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