Malicious PDF — malware analysis report

Static analysis result for SHA-256 55245de3a52701cf…

MALICIOUS

PDF

98.6 KB Created: 2021-09-07 13:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12d48293c3a26fdfa0c10847669e55b1 SHA-1: 0bffec6443b9683a34da38e3d675961d5a42e25c SHA-256: 55245de3a52701cf5e396c80e6deb150021229b72c95bc067cd78f68a41dfa14
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites hosted on potentially compromised or disposable domains. The embedded URLs suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/0e6d289adfd7c69b3c31074637da5457/fuxigiteduratumila.pdf In PDF document text
    • http://tdfinalists.ca/clients/43449/File/65460047149.pdfIn PDF document text
    • http://herve-coiffure.ci/files/19594883054.pdfIn PDF document text
    • https://sealskinz.ru/files/file/23946154653.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210829155028.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e59574320d56b45cebdb7cab48142f97/lutoji.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/sikaruwoxiritopinikawi.pdfIn PDF document text
    • http://web5gstore.com/Files/files/kameseguj.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6ca7fe2179a6f67ce4becea6bd6445cd/kimuvaxizuxesufafowuxo.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5ef5e1c9a328f33c9db7520936aba812/99512675153.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/12f6be3c45acc36a7cf4f59a084e5afb/maxufalofegizake.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/190c5de5b2a2cc17237220529bff8a53/bugekanidobudurotu.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/ratubutuponunewojapuri.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/1cfum95jm6fmnngu53jftl7mfn/61945515971.pdfIn PDF document text
    • http://kaies.net/upfiles/210825040836591390im7f25.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/a4r9qh0l4ufs684m9jbt4u5c02/kogerobup.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/4bfd6a616aae1ef489a22a92aba457e8/dupagulezegow.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/vumopajakutobowis.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/61209927588.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/smek7eb0pa9mbpgo0fn8m9qat3/75644391472.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/81958d0362fa4e64bd74e1ebe19c3f53/51879445173.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/37421411198.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba059e639eb---87587824714.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/juxupepuxokavasubolep.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/guxedugivukawubetojef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=basic+perspective+drawing+a+visual+approach+pdf+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC31 18052 bytes
SHA-256: e1a56863ba7c50560b78675ff7f5f3f0ba075c7408c7013820c8bae49a299807
font_01_sfnt_off00011812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11812 11204 bytes
SHA-256: 6956b587c791a0a8e764830dae7528323b6cfb51fb6abd516acc5dbc30dc6fc3
font_02_sfnt_off00013224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A36 18832 bytes
SHA-256: f54277ae90eb2ff493e36eae79be36b5af93aeef2df24e10b8c245e989389780

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