Malicious PDF — malware analysis report

Static analysis result for SHA-256 83646f38e771cb72…

MALICIOUS

PDF

77.2 KB Created: 2021-09-13 10:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f83f01ec9d7bcd42bed68fac5c5896d7 SHA-1: 05a4266abe11685dd6f548f5908e6acc2c3f8a91 SHA-256: 83646f38e771cb7255d31eb529c422b651d241c2d3f5436e25bed1dc534e253a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with a 'utm_term' parameter related to 'pokemon go coin hack' indicates a potential lure for phishing or scamming.

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 https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ff2c39b9ffaeb70ea697151f762a2d20/jelijubotijirozev.pdf In PDF document text
    • http://topaslt.com/userfiles/file/47516510588.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/90532679839.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/vikevitewegepi.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/kupolotewa.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe9c7afb61---99924225769.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/32633376656.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134504ba4ff7---lukenexewuwakumonowet.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/20742386652.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/dewimegitot.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/81921314192.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/13493389814.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/gevonojipemorajaxixibedaw.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/jixujenaduda.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/rutosidugedarowito.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/deruvofakofazolotu.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/78571741413.pdfIn PDF document text
    • http://becucci.it/userfiles/files/96998331645.pdfIn PDF document text
    • http://adice-area.com/pictures/files/21137135572.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/26544212897.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/75832765417.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0e1f53d05a87b4a0bccc8f62e89fbc70/59681633278.pdfIn PDF document text
    • https://msvadba.ru/files/file/vizojo.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/94637640542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pokemon+go+coin+hackPDF 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_off0000c9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E2 10356 bytes
SHA-256: e251d8f5660c75ebb51768d6b1f55cb4665c7576de3bc9eeda0eb27489d8b05c
font_01_sfnt_off0000e117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 17980 bytes
SHA-256: 637a56c497011bfc5e47341a02d519344ccf4b43a92a4d37917326963cf5e93c

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