Malicious PDF — malware analysis report

Static analysis result for SHA-256 5715579a43a24db1…

MALICIOUS

PDF

76.5 KB Created: 2021-09-18 01:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 930151ec5736fe816600eae39a83358f SHA-1: fb4e016bec57148bee5add4bdf2a60259aada179 SHA-256: 5715579a43a24db142e1a79432da0b12a6cb55320b8a969f57cf5d30d9702c71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://www.hkha.org/ckfinder/userfiles/files/66396518194.pdf In PDF document text
    • http://pcwenhua.com/uploadimg/file/1631177245275779712.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/nefozoselubi.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/93998987712.pdfIn PDF document text
    • http://dharkaninternational.com/survey/userfiles/files/rajedifevituburulavopat.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4cb32b926---lubefozimaxododasegizulib.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/rasozajero.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/lakuzijikokogetud.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/45421563521.pdfIn PDF document text
    • http://nemochem.cn/upload/files/zimubo.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/su131jpjvc35e1vb12t4pjpdl4/31999113226.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/35778753596.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/renaludevogumopo.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631090707.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/49757128108.pdfIn PDF document text
    • https://theipbuzz.com/images/file/zatuvobesuloveneke.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161369bd82210c---wukugunogo.pdfIn PDF document text
    • http://ktcz.eu/files/files/10275461019.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/jesimaxomavodobu.pdfIn PDF document text
    • https://tl-systems.hu/files/files/jekanegipumimafupamamisip.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210910_153153_200.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dad6001d82---rabuwani.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/23717657694.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/tojosufijafugufebebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=call+of+mini+zombies+unlimited+money+and+crystals+apkPDF 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_off0000c761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC761 11320 bytes
SHA-256: 1a800cfe8db6852d27ae7b4ac0a87bc1e0839cfb9c283f12bd7071539dd0dadd
font_01_sfnt_off0000e1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 16332 bytes
SHA-256: 04333f270d5d96821718396def580c00b116dffa29a8389820d8f67203620f30
font_02_sfnt_off00010b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1