Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a728d3d37397691…

MALICIOUS

PDF

85.0 KB Created: 2021-09-15 22:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b956bdb9abcc7a4340086a731f70626 SHA-1: 80cc2457392676359d5e42b2c0d177b6529af384 SHA-256: 3a728d3d3739769100c0bcdf74785aa8750450b4288904a6532fa79313d02401
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting it's designed to lure users to malicious sites. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or redirection attack.

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 http://www.smartlandgroup.com/ckfinder/userfiles/files/42065906160.pdf In PDF document text
    • https://e-ceramika.pl/userfiles/file/98573119727.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/1778539328.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/aa566e49d27fafc0191d86eb5521eb13/28110007153.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/gesumagavurolip.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210906233415.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/wefilirabelogadu.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/25485532811.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/49728980569.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4bfa57f39---56538616554.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/69473596255.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/wotogurewijete.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/gipikujusivi.pdfIn PDF document text
    • https://ottopianos.nl/files/15112501434.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-4/20210904210657879175.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/n3clhq9gc7qcsh38om45e1ets7/29116128872.pdfIn PDF document text
    • http://ciskmv.com/css/file/dasatepupumi.pdfIn PDF document text
    • http://myphamasia.net/upload/files/pamizewibuvoxarojefu.pdfIn PDF document text
    • https://termofriz.rs/files/setetukawipudaruj.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c8ece80ad1ec63ae69624b30da2a9809/15551778413.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/zekirojasebuzu.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/30889013242.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/96065970731.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/fuxozuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=watch+kissing+booth+free+onlinePDF 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_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 10840 bytes
SHA-256: 6498a42eb8de7d77950dc039d12a86a949420587be12ad8a986d17c6c6b9aec3
font_01_sfnt_off0000fdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBA 18532 bytes
SHA-256: 44ddaca9c87fb1bb6626f11588de9d8b623c64b9414f6bd87d50342524b39fd7
font_02_sfnt_off00012e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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