Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ba45c2df98eaad…

MALICIOUS

PDF

87.6 KB Created: 2021-06-26 01:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7da9a7d2bb5dc502fd3e3fecc4f5777 SHA-1: d5a3963dd3c4636a4dc95c0b779d9b3577c51acd SHA-256: 39ba45c2df98eaadf860053bbdb3f01e8bfb9273fcdf8369709d3be598ce7d70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to drive traffic to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://brette-animation.com/userfiles/file/30959113776.pdf
    • http://ekhoron21.mn/uploads/files/68372825340.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tn9ob1nfc8abljfdtf06g8ud31/17280167328.pdf
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/60639702232.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59f3ae5533---kepisibojebilifezejasiv.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/283fe02c170bdfd73951735dda99dd10/jakenipemozumor.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/4865323659.pdf
    • http://aqbnb.com/uploadfile/file/75146353088.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160745b0cb96f8---veziwuravovibiroposof.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/dq5bhmjk89k1o1vibnk12nm425/65192435419.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/m42k9r7o36qm26h9v339neepg4/65434733080.pdf
    • http://allmedicus.com/userfiles/file/xifixatuboxej.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfae5ef43c---doxebagaxujejifetupunug.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/zetepive.pdf
    • http://prof-cosmetics.com/upload/files/vozezuserisobefavi.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/64d45806f711ea17cf158ce6cb73db89/44582778838.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb98662af---41839261637.pdf
    • http://files.ibiza-ferien.de/file/78103229379.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160822f186b78f---324131539.pdf
    • https://sonarmusic.hu/up_image/file/tuxilewabose.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/62c8087765cd53c537f8e087dfe9caef/64140084450.pdf
    • http://preserveproperties.com/userfiles/files/83825726241.pdf
    • http://www.kilincsweb.hu/fileok/file/nojilefawozazizukesal.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4410de307f---91956611571.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c5158e010---disewirawoge.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/b75a682fd607c0f15b202eea3433bd2d/vimizutakokozalinadi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ankle+impingement+exercises+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f589.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 16792 bytes
font_01_sfnt_off00010d9b.bin
29e070f38e1b7d28193dd7883a500694adb7278cfd482671f4fb6db5a15d6fa6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9B 16428 bytes
font_02_sfnt_off00013832.bin
44d60481d88b3298e897016d2a11273c7b32b0b0dae8476726f6f38a90e1092f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13832 10856 bytes