Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f5c17b0e066ee9…

MALICIOUS

PDF

86.4 KB Created: 2021-09-05 04:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65e9f4e2ac5e37c82b33078fb6272c15 SHA-1: c84ed793593454c056a3aa66cf5fb8c323295927 SHA-256: 33f5c17b0e066ee94fd3b6a94bb8b454158f3b0cf65f7139747bab33fb0640e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites for phishing or malware delivery, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=ramadan+calendar+2018+delhi+pdf
    • http://novafish.it/userfiles/files/68034235825.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/mkdt8inqv9i34c08iu3ah4l0ao/4924228466.pdf
    • http://28777886.com/Lpf/UPFILE/userfiles/files/pagirofesemutagexiv.pdf
    • https://arichaindia.com/userfiles/file/80443312838.pdf
    • https://genegurumiraclehealer.comuserfiles/file/sasixarevupetapawexuvor.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/afq99lrbsnj853o74qg6h90116/wezepujopuxifamozam.pdf
    • https://airflow-skateboards.com/userfiles/files/23528765323.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8d7e1343559efe7be7404cb068f0d405/25783544977.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b72dae3897a---46652482809.pdf
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/welexezevorofaraz.pdf
    • http://eaas-journal.org/survey/userfiles/files/lapixekulelijuvaworakub.pdf
    • https://anmoul.com/userfiles/file/78156851965.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/51196480043.pdf
    • https://namdolove.com/FileData/ckfinder/files/20210818_8D0EFF16158B915C.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e2140521b---lutupatatesolif.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/gugive.pdf
    • http://www.cerel.eu/images/wyswig_images/file/20454075697.pdf
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/90087388722.pdf
    • http://ozkayalartrans.com/userfiles/file/kanoto.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/31ac7054fd64b1537b6bd8482230a655/85530302430.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d33d7b51f0a---98313939231.pdf
    • http://pphjako.pl/userfiles/file/rubomugojuvotovipume.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/q49r15rf8q007nq0noffr95r3l/70373487270.pdf
    • http://serramentisiciliano.it/userfiles/files/boxigob.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c996f7d6dd1---xulati.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ac.bin
0b5f959b7b30cc4dff831e9fdc744dc9dc488c4873814ed2e25733e9b4794919
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 11044 bytes
font_01_sfnt_off0000ff2c.bin
17f068bbdcbcae83cda8d019e80b41cb924a027a1cf054b28b5b01f9ee3d53d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 19524 bytes
font_02_sfnt_off0001319a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1319A 16792 bytes