Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6db7b85e52dea5…

MALICIOUS

PDF

88.8 KB Created: 2021-09-18 08:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7028facb6036b9072f145eca7f915d06 SHA-1: 627213bcf14a5c0d9c1369be5b4e56a9f4d5865a SHA-256: 3d6db7b85e52dea5f65ebbd6cac972eabbcea924437fbcb6c2f5cbed3f333e2c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further support this, indicating a tactic to obscure the true destination or leverage vulnerable infrastructure.

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://laborke.ru/uplcv?utm_term=nonton+film+bioskop+21+online PDF link annotation
    • http://sinostandards.net/upload/files/gofekamezel.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/53162730437.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/75311845693.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/sijafugiwubojezow.pdfIn PDF document text
    • http://tiquital.com/documentos/file/xugesosokarurujegulugudi.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/66489952806.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144a3e504bb4---gojogire.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/vagavuz.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/bamukotizedabogagukavi.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/besibiribiminirujifawo.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/70667150235.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/89357219472.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/garipa.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/76151623527.pdfIn PDF document text
    • http://posuni.com/userfiles/file/migoro.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/32470073395.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/6ckvnqjk12ocdfl6q828ilnuui/96799646479.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/nuzegobin.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161455a9eaade3---lubetitovafubujulefarolu.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/74878452386.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210909_82D027FF2502D11F.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/64318463021.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4fdc7ca9d45f72a3866fe3ee4ad57f7f/37630830514.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/31027101673.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_off0000f9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C3 10636 bytes
SHA-256: e64f9a776380bf2ac4f65a6a09418cef5d330fc244404f5281b6cbfd0e470745
font_02_sfnt_off000129f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F6 17068 bytes
SHA-256: 979a5aa8678a5a765f4fcec023b49c1ad83bd796e3768dbcf4dba1fc7d464109

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