Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5c45cdef7bdd5c…

MALICIOUS

PDF

86.9 KB Created: 2021-10-07 08:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6a414be89bf15fbf231fd6a90018510 SHA-1: fc72819deb758a286ea1cb374cbc4f28dd81bbef SHA-256: 9c5c45cdef7bdd5c233e32d9153e104a8b0917837ecb40802dd8d9c6346ee880
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The presence of external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://oniceh.ru/uplcv?utm_term=donkey+kong+country+game+download PDF link annotation
    • http://itagqatar.zajeltel.com/itag/file/files/13551423857.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/78729762325.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20211004194214.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/83441832418.pdfIn PDF document text
    • http://jadeite.ru/images/file/88659696809.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/basitifafozopax.pdfIn PDF document text
    • http://normel.org/files/upload/file/vikevigotosona.pdfIn PDF document text
    • https://interconformity.ro/images/file/nilakovumijafajusavitero.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ef4828e32---zetulojo.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/56389415645.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/25559301994.pdfIn PDF document text
    • http://spiregene.com/image/files/20211007_001248.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210901135927.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/lobabupepabunuzorimod.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/bd728174fb8da632fbf7559c8467abb3/lakofutukobona.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/37468025974.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/xavazimisojujotididinax.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/xifudupafafosudelogufav.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/7962187b46726a5d71ba86bf2f179cf4/7324867385.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aeafbcd215---50266955286.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/biwevujapinizufudef.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/peforazadamalafejulesoja.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_off0000eb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB16 10848 bytes
SHA-256: 1fd9d5e524d865f3d3c6fd19ff355f12bf6a45c1c672ff8fc16b8aca563b9519
font_01_sfnt_off00010408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 19172 bytes
SHA-256: 120f0a2e74cfcaebd70efa5be0eadc9c62c3a557e91e4a72da0fbfee3d17a562
font_02_sfnt_off0001366d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1