Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d31c599f8e60082…

MALICIOUS

PDF

87.5 KB Created: 2021-09-03 04:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c5a0df366007959ac0b1c8f30dc5bf7f SHA-1: 3025a917c392f49ba8d6f64f126111714d51cf8d SHA-256: 4d31c599f8e600822609783464fd339e1460b9bc1304d9a20673507f89af9bc8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting sites. These links likely serve to redirect users to phishing pages or download further malicious payloads, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160983b4d4f4d5---papobuvopazokego.pdf In PDF document text
    • http://noithattamphuong.com/upload/files/18040424355.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/davox.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/jalonusezovof.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/teruboleb.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/70887732597.pdfIn PDF document text
    • http://vinmexindia.com/uploads/76968035018.pdfIn PDF document text
    • http://enkepharma.com/upload/files/vebebiv.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210516101523.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/2ef63d23b5e60bc38ef1cb9fc143f510/zutumefuzupekisenor.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c488d047197---novitiw.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/822654265.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/85602477070.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b48d02d629---vibolew.pdfIn PDF document text
    • http://cy2hand.com/userfiles/sogarod.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/vulebukulubeziru.pdfIn PDF document text
    • http://dichvuketoansg.com/luutru/files/sujupebazevulovisokozoxi.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/13486354182.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/dipegipufaroturejewifip.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/r0g57sn9khtafq61set4lgs84c/62917385980.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/19921120601.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/36f2f201652916c7150a30a3902adcad/7547432212.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210821073156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=c%C3%A1ch+gh%C3%A9p+3+file+pdf+th%C3%A0nh+1PDF 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_off0000d7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A2 23768 bytes
SHA-256: 0450c7dfafd36e7c446ef8010675fd86efb173b4fde6ccf75e3a1111bed28e39
font_01_sfnt_off000114d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEE 11120 bytes
SHA-256: 7ebb02f3a3e1b36d5ea371fde50ab6b630d0aee93635d6eb42058eb73de724ec
font_03_sfnt_off000145e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E3 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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