Malicious PDF — malware analysis report

Static analysis result for SHA-256 35787f5edcdbba48…

MALICIOUS

PDF

79.4 KB Created: 2021-09-22 20:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f17230e6a1f31fc2776d0ebb57e998f9 SHA-1: ac2f4607dd1e77231a8a4d7f9d0081bd3424dbc3 SHA-256: 35787f5edcdbba48facc013c8c4d863b3198d80951ba580004afdeded822cb7f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that redirect to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external resources, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ketchas.ru/uplcv?utm_term=vishnu+sahasranamam+lyrics+in+tamil+with+meaning+free+download PDF link annotation
    • http://ros-audit.com/i/up/file/gevebesireviditaru.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/3279f3b457a4b4e7b357daaacd479dc9/puzesavadokov.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/mipavizaga.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/46922763158.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/metobuzedosifinowatin.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/xezavukebip.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140089f5d327---loxuloduru.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/68ccab0c55eff0ff0e882325e3032fe7/89638208770.pdfIn PDF document text
    • https://frisch.ro/files/file/21268369786.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/fulufotewifirezevikal.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/47768330913.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/vudaxaje.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7cf94763baeb40bde7415ff8c406a87b/xetapebuzopiwizijafafuzik.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/20286495488.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/46991266936.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/puzaxepavewuzojajezu.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/45799597238.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/36780887528.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/83812451614.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/matibodavip.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/sinunowajiwukubekikos.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD93 20936 bytes
SHA-256: ad457e27bfee3e8ff2f5e1ef8ccd69aff462762c2467b237a676d0f17a182532
font_01_sfnt_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AED 1776 bytes
SHA-256: 5df3691c8e7c4cbc28bd9a15813b86c32f5266304be0e6eca3494cebcd22c3f2
font_03_sfnt_off0001134a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134A 11192 bytes
SHA-256: b69ab9456a05ef6b14f004d50dbd97da73940c20403c6f527c255f310d217619

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