Malicious PDF — malware analysis report

Static analysis result for SHA-256 6abeed1ec3782b96…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 12:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5afa3e50e635e87a45090d4ce051471 SHA-1: 5e32a274c8d91fdf44113d4276252c27b0a62250 SHA-256: 6abeed1ec3782b96c9d194bcb338fb29fbc2394d2b9f4ad7974e5b1ff1857d13
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of a link farm and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://feminella.ro/upload/fck/joruxidel.pdf In PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/29830569531.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/35876964453.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/4a500c549bb244004d21994dfea0b614/52013639790.pdfIn PDF document text
    • http://elsped.hu/files/file/zufosujitibe.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/kejapivatixunazavevowovas.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/vigenaroxobi.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/delazupabuzomimizo.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/lalorila.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/2453608859.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/giwuk.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/momajejenolagugobimojatil.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/jupijujimomu.pdfIn PDF document text
    • https://advik.net/userfiles/file/95932620004.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16142acad14346---49869666940.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/tawudoterabubakizalu.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/58106048004.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/savuduxarebunojebalon.pdfIn PDF document text
    • http://allycatering.com/userfiles/3348415291.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/59752674692.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613803954afac---27480746921.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/fobazimonekug.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/29723835497.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138664c529e3---43404622886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=can+you+transfer+photos+from+iphone+to+androidPDF 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_off0000d120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD120 10964 bytes
SHA-256: 9ae53683bdd00ab99473f2c08453c3489e8e73daa5f836b17e03b638c6d7cbb2
font_01_sfnt_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 18952 bytes
SHA-256: 46240a767fea0d83c486b5fb6a3f282084c0671647d52de0f7a91c79b6c25b27
font_02_sfnt_off00011b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1