Malicious PDF — malware analysis report

Static analysis result for SHA-256 94fa6e22cccbe6b0…

MALICIOUS

PDF

84.8 KB Created: 2021-09-03 07:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af01ecd14f276410022573a8f668fa59 SHA-1: b3d250fa49fca85ebf895d371e5170d1d840bbbe SHA-256: 94fa6e22cccbe6b056d4c2d7ecdc564dce01634058b1be04cb737d89764e0c31
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or SEO poisoning campaign. The embedded URLs and link farm structure are designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e431ffd5---84037401136.pdf In PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ukdekmbthklasqm3cpb3essh5k/19581790555.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a398b350d57---ripotovowasak.pdfIn PDF document text
    • https://camelcarpet.org/d/files/mumajinexiwef.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/gozoweres.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/lipafimezumom.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/4378574002.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/69499288052.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/14066356085.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16081921ea7d11---61831992923.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/48325369100.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/buvuraxotosofetomuwobudu.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/30533610407.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/5c500ad269034ff4cc28f1259a9eb32d/romegifinenuguviwunozetu.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/84347689803.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/194eb42827cac9a3cf0f0f92756a2415/64833447539.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a1956575ffac49ad7d5ea7b967aece3b/fuvitapu.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/damokiripozixoralozuwedi.pdfIn PDF document text
    • http://sciattella.net/images/file/dojeriturupevoxuvod.pdfIn PDF document text
    • https://coil.hk/upload/files/kuxejinolegukara.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/vonefetopamivano.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c295958f7dc---81974075876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=structured+system+analysis+and+design+notes+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_off0000e456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE456 18168 bytes
SHA-256: 74a2050de80e601a675a7799ec1c2de7c358802b352aee4b76145609ff48da5a
font_01_sfnt_off0001132e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132E 11252 bytes
SHA-256: 6a179e7f06a725cd716e86cc9003371b32cda7b958fe55a1115b112213689078
font_02_sfnt_off00012d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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