Malicious PDF — malware analysis report

Static analysis result for SHA-256 471432d979dadeb6…

MALICIOUS

PDF

101.9 KB Created: 2021-07-15 21:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f97f53f821de625ca8b3c99e4120c466 SHA-1: 28e2776bbe57f226610548be08bc5e43bfffd7fb SHA-256: 471432d979dadeb635770bd3c36052a729ff66cfdee5e8b8185898e7ac07e6ae
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of external links indicate it is likely used as a lure to initiate a phishing attack or deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://crysiq.ru/uplcv?utm_term=listening+and+speaking+pdf PDF link annotation
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cee42955b5---38583872429.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/a8946f7fecae113ac541c244e84eb82e/28987811505.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/6m56l1sdqiventspjo6vivae33/74578962763.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/85570154690.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/dff1a25865779acc30537c411d9b8f4e/kigiputavikirewu.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/duvusiso.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a8b4ed607---76089013748.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7780dd2d09---gojujifate.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cb6c0ff3a---58635562502.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/56434538420.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606e646f043c1---42352702511.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/jpvih9h0uo79cih1ra03o7djd7/75794762181.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/c17ba3962ab5b4284edf0f509cf5252b/53202897786.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/b2q5pk0rph6ve5c1osicpcv3ov/webapunekavob.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/xolalawazolaminolevodalo.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-23/20210623075323836275.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c99b10fea---fufugidigovoxa.pdfIn PDF document text
    • https://asiahijau.com/contents//files/zerogatukozewenedode.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/f660a616cfc6851d187cd08827308d76/wotutisopazeso.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/418735995.pdfIn PDF document text
    • https://argumentua.com/i/file/devedazexenujanula.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/21768243762.pdfIn PDF document text
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/45379843761.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/21605691014.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_off00012b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14393 17704 bytes
SHA-256: e1a4de490caf3ed7d296d33c2a4e61d6671ea9b3ee36eadea0478bff6c504450
font_02_sfnt_off00017151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17151 10456 bytes
SHA-256: a4efccda6cad89f3c791064767709772a06d688d204169958367e47057c58641

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