Malicious PDF — malware analysis report

Static analysis result for SHA-256 9664e7e5479b9d5a…

MALICIOUS

PDF

89.6 KB Created: 2021-09-08 07:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 58e0c4fbda3cd6487b43e5549cd00faf SHA-1: c2abf3c2953f737769533039574a237ba5192024 SHA-256: 9664e7e5479b9d5a508567b635e5fbc1ee00abc508d96e1f8cfdee4ab36b322a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736f7674972---64194808507.pdf In PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/rekobomuwezezojavu.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16072ff76c8722---29674746320.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/44786711694.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/26749341967.pdfIn PDF document text
    • https://brod-plovdiv.com/images/jajuvobarilarebunoze.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16106c39cdf53e---13357065143.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/d7658b70581bdc47924a32a94112b763/49785132339.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868c390c15b---vukererag.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/rubir.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210731051432.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/58552315129.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/61358567589.pdfIn PDF document text
    • http://sdes.in/uploads/movul.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/5af8e89257a735b9b17d732229eeaf82/penexesudam.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/86315f9ea7f0720343dbf08fbc4a563d/gazerawixa.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c03d76b6529---81047765510.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/36984118204.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071abff77e4c---nenugilalori.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/dea2de196b855dd35f22b36a77903d42/70283598235.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1625745442.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/44081113236.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/91601195475.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/q9nqm5v0eluajq7d5mbljhoc03/fanadivozodina.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/dovas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=sistemas+energeticos+aerobico+y+anaerobico+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_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 11244 bytes
SHA-256: 77c063ef12f1504dd3d8a14e6fba54695a9dd781fe680d05ef17a0af45dc3329
font_01_sfnt_off00010fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB4 18800 bytes
SHA-256: 0d92ed30ba67744c29023f7f22e248a7a442ae53227b9cbbfc5a568ea46d5840
font_02_sfnt_off00014050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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