Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4daf30bb01ba6d0…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 14:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ab4756e657eef7f106eb4988be1d918 SHA-1: 2498ad64a1bf672f78f2c36044f2e1fea16cc6ba SHA-256: d4daf30bb01ba6d02d04a657383aa22a1dae99c3bfa489a0d75645b3103fe8c6
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites, including those hosted on WordPress upload storage, suggesting a link farm designed to redirect users. The PDF structure and the presence of external URI heuristics indicate an attempt to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://astdubai.co/userfiles/files/35317671950.pdf In PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137b0b2c657f---wonijagumowapib.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210906053749.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/59259818506.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/14645004188.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/69000226363.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/nowirurimozaporokozikud.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/rezovamu.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/jokipopelatotosopibuf.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613568c877993---javej.pdfIn PDF document text
    • http://btfa.tw/upload/files/88874537107.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/57e1af0e416ca9bfdd9095e11ded1e13/29302723209.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/gugepikakokavofutumob.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/ronokubeweletulaxazesiwi.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/67892873263.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/13393019049.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/bowefusipuzuse.pdfIn PDF document text
    • http://ilkemymm.com/image/files/18406301633.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/28738777402.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210908_0134850329834D83.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/fobizamegu.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/wezelip.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/wozoritosotifijitemabesub.pdfIn PDF document text
    • http://52963566.com/upload/file/202109090111316042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=insoportable+levedad+del+ser+pdfPDF 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_off0000da92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA92 10556 bytes
SHA-256: 33e6ea0b1a2cb58736f94e4158ef8f16aa4c63fc209a065013102857570a9a90
font_01_sfnt_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 19980 bytes
SHA-256: 0e474cb7efa5553ae058469b8dfa356f8d78cd0f72fb4bdba2df316cc14eed7e
font_02_sfnt_off00012531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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