Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc3b33672924ed4…

MALICIOUS

PDF

84.8 KB Created: 2021-09-21 06:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1def87054091b342490d6686e41d73c9 SHA-1: 1939a742de102b4f16236773604281dc820701b6 SHA-256: 2bc3b33672924ed4c9192f32c85b438ae8a026c8de1097be99abd42a654a6335
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613261b17b2a3---pugetuputuxeborovarida.pdf In PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e65932d0eeb46f095317727936e83fa7/fawel.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/68303710585.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/71541920967.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/jikidanu.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/1qt892h6iitj8phevp2lkbda0i/wadokovajulalirizosiloge.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/36676582237.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/50878313053.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/82992695114.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/77005924982.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/67700427547.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/tubimugipobakejal.pdfIn PDF document text
    • http://robedecreateur.com/img/files/jamivaxafesazuk.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/82786914557.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/34877523903.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/puvexitute.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/99757608694.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/42068668645.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///monug.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/bulalinexipimoxokejesuwul.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/tekenopenowejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=i+want+the+meaning+ofPDF 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_off0000ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 16984 bytes
SHA-256: daaf9a59115138343be4c31dab7a69610c4e3e40904130db87ec0dbedbf2ff16
font_01_sfnt_off0001162c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162C 10384 bytes
SHA-256: 244812234ee9b69632da1cd8b28b91b8eb2b11cba4ab9723e924ad14af4b7639
font_02_sfnt_off00012d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1