Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d654db6b04dade8…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 02:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fbde30aa48c5d2530d03bb3192dd6cda SHA-1: c66722e27df709e492c168b049007932d1479bc7 SHA-256: 6d654db6b04dade825973976a804ed1442fb3f8e9de2e26aa1d779ae12e6fb84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a link farm, with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=past+perfect+tense+past+perfect+continuous+exercises+pdf PDF link annotation
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f7bfc1aaafa22c00ab8de9f29d9d0ee/bawudiwene.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/36055553683.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/jeturepojigaxaxe.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/89674657952.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/72602973799.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24f0c92e83---novufogot.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/uuo5ioeo3m8eks3r747au4olj0/20121708467.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093a65817b35---livevenuxew.pdfIn PDF document text
    • http://email-database.info/userfiles/file/57485678738.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/5533abfa9cb079625c6798898e1a8647/zewerikiwawon.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/36433077593.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/70119b16c3553a5776c163b6e8f6d05f/subolejemuxufa.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/57a0899db05dc3ebbed8278c06671079/witavopikokuzesebigesa.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/sigelamitomunodinora.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/62596680070.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/7603650088.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/69353840956.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608650667d49c---84747093056.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/bamokimir.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608d41be5fed8---8930691414.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/a8d58d588ddfce842048b68e874ae9d2/44374482458.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f452e7d70---54441246079.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/72452220388.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_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 10768 bytes
SHA-256: 74eed9ff093b32fefa18f4e79347586bbb40a826860796173c00f9f6412a09d5
font_02_sfnt_off00010f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9D 18140 bytes
SHA-256: a4e6b066a497e7e4991209d7bea156a805ef762f3a73466b48db9c2df7a0b4ba

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