Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e71a286295ea4c…

MALICIOUS

PDF

76.2 KB Created: 2021-08-30 12:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 97d083c54d50120cc4b4ca1413708934 SHA-1: d705d94c66d0e39183593154171ea5be00b99b05 SHA-256: c4e71a286295ea4cfdb8eb507d8d98f7f8c5ff2bddb456d03e75a6d2e27f9c56
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised CMS platforms. The presence of numerous links on disposable hosting further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bezpiecznamlodosc.org/files/file/79730740395.pdf In PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/783cf7dd54ce9a04a1689c2e6f8a4896/78875436188.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/fisetavakixolasaso.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/19737686826.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/saxinusexiwajitakejeferos.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/80773584082.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c30839475cc---13655578162.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/sotesezumur.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/613098619.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/00c8a9354e23cc4891b4c70219406201/vapopom.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/jebifizosu.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/navipexofojewevukaj.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/zazimu.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/51767944255.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/67689364486.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/92589712818.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/14922683251.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/10bdb14f07ba894f33f92600e188c214/2891024028.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/80060534302.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/5715450232.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/97400234911.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/37471588641.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/89866511185.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c6738747856a2993d9d2d2caa0b1bad1/xakelilajasisimawazovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=things+that+rhyme+with+thatPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C4 17416 bytes
SHA-256: 3c2b4ef616a3734b02ae47af35a780dc32dcdf05e5ed08d293b9844fa88d480b
font_01_sfnt_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 10552 bytes
SHA-256: a01a1bea326f81f5206120a7575c1264c8e24274ec811851e9386a8d077553a7
font_02_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1