Malicious PDF — malware analysis report

Static analysis result for SHA-256 2494695cb96ab8d7…

MALICIOUS

PDF

77.3 KB Created: 2021-09-06 13:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 77a2054ed0e09e59dd5a7840060af25f SHA-1: b3bd9a07808b0ea6ecb8337eb1e8d53002cbd256 SHA-256: 2494695cb96ab8d7a09d9d2b79dc9eecc2e1986f3b62d20a00fdac0d28fbebd3
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign where the initial PDF acts as a lure to redirect users to malicious content. The presence of numerous links on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0dba14efa---damar.pdf In PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/48ccd0e65fc34f3309a82da603b18a2a/pokazamawajoj.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/worazakolojunixiki.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098302551bcc---34156947354.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac125027e05---81516889606.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/4e8bc98edb26b21f347ad42fc5bc6e99/linisevixozofi.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/4v3rsif1ai7umv6ovgg124olgu/19089667057.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/tomurejesilemenamasaruje.pdfIn PDF document text
    • http://15881588.com/ckupload/files/suganawipuxoredufobuk.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160b7818f94e2e---winozewobopufirogasevego.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/wexuv.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/50355032206.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/fexinewimozufepo.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/10049756431.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e22826294---vusekazonis.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/72954982822.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092598f459a1---10934790197.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/85918078287.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8a9a0c8c90---3789237525.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/24920315412.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160985f2fdeb29---48041614560.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/929162f5bd6bcaf070688f756a455810/37663430563.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/4513256285bb1ebb2a0cd26ecaf5d527/jibaxiviragezevenafa.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/1286426931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mri+abdomen+anatomy+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_off0000cc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42E 16728 bytes
SHA-256: 8deeee8195456a67863e1c8844f5cdc5584f600d1dec8a2cc2414b26badaeae8
font_02_sfnt_off00010f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8A 10692 bytes
SHA-256: 50fda846e0990cb0981083050152715600db079719dbab2bedecb229a8031314

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