Malicious PDF — malware analysis report

Static analysis result for SHA-256 684db88d40e3b992…

MALICIOUS

PDF

79.2 KB Created: 2021-08-29 16:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 54fe63cccd4d6e24c79d84a630ed365a SHA-1: 1e2067b6e5ba320944b403adab0bfdafd3033491 SHA-256: 684db88d40e3b9928bb0ad3eda540e083661a97b66f8b3ebab088672a99bc805
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves luring users to external, potentially harmful, web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://medvor.ru/uplcv?utm_term=spotify+playback+speed+android PDF link annotation
    • https://atvatextile.com/upload/ckfinder/files/korumovirar.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/bazuvuwenipikele.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021715153375192.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/30984672922.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f05bfc7f39b0c6abf1e2f76785dd86d2/ralubegonofonizaxugofu.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/duzulibemega.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/1de147b0b94100d0e41b9163640800c4/zejoderozojukosadanas.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/pirokovodatadivel.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/40962042612.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160786fa0a84eb---zuvikuwa.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b98765727f---gajadizawelagurunabami.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/29go4slkbld1jp3n8k66hq4i2p/51479226987.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e457c956386---36323167406.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/7482825707.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a7134929715---43627802891.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/0e740vilvhlbd10np0dq51nnc4/putubepirogadu.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/dosuti.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c010576629c---62375301700.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/4537715190.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0d6bd530---87941072254.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16076836998138---64068407092.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/tevufegumovepatela.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/jojimive.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/sarirelijegomofijides.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f8324a73fa5---10156525203.pdfIn PDF document text
    • http://schubert-hh.de/image/file/savuga.pdfIn PDF document text
    • 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_off0000cf57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF57 11032 bytes
SHA-256: df4c9c562bc60f24b1a16063f8e99a7be6d406d79f36a0fbf93fabb7c7961ec8
font_01_sfnt_off0000e8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 17868 bytes
SHA-256: cbd579960b4cc5b25dff121a2d2ec092de740043cdf34d4fd4a3a4cbee95e1e2
font_02_sfnt_off000116e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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