Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ac990abc565006…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 06:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dffa474a03865993a48045ddc08d893e SHA-1: 5a9c28105056a4cc5f787aeb193f57083ed36b29 SHA-256: 77ac990abc565006e797db57f8ccf22cd31ec6658b2a78c65324ac58a257ee4c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm or redirection scheme. The presence of these links and the nature of the heuristics strongly suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

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://nedirajtebosnu.net/userfiles/file/zodurizetudenasolexe.pdf In PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/gedafomer.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/kuzawolosib.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a20b31a2e---46537978535.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5e8gqq5io6o0bjhshuogqleok9/jaworosepo.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/54603221464.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/sipiwafaregewesizetabadog.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/47588998241.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/989ca8f9d8170ed5de3d759d2656b10e/73956356697.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/tajodopolokugoberel.pdfIn PDF document text
    • https://diphong.com/uploads/roginalumowilavewu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f6857ebe6---ximasobozamuzategi.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/popojojawimutu.pdfIn PDF document text
    • http://esangsok.com/upfile/files/gasirusisa.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/vokamotogez.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/74052587646.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/76351247694.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/29113523062.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/xivedapomatibuvose.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/degagatamaruvap.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/56225625793.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/21748623126.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/56513127563.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/3374578909.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/pufur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=can+you+use+itunes+on+an+android+devicePDF 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_off0000e382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE382 17620 bytes
SHA-256: b1a9ad7597067022a9a36784801ef82d0a1d11c1f34f1033707655e4030c170b
font_01_sfnt_off000111a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A1 10628 bytes
SHA-256: fb38d532539765de113d3654becfec07d6252a6d453f5bc18bb942adbe0bb50a
font_02_sfnt_off00012a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1