Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc3ddbdd98bde08…

MALICIOUS

PDF

84.8 KB Created: 2021-07-02 20:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35d6ee795a46953520d6d8cefec4c3e5 SHA-1: 8f6b072e5cb40d4d8ea52a071b052edca9a4d749 SHA-256: 9dc3ddbdd98bde0875dabefe29a638438ffd07fc253fd2cd77b153ef80a79150
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess its nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/60159654853.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/74n07nmoi3hku51elddihcfik8/69711196969.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/61f2d0e734779c3f62c8c86e490868fd/pigojuparabebafaritizib.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/72d09354d73dc1a12dba134c27d0b5f1/81308489852.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b03e043b4b8---70532943670.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160717ca28df4c---17200762863.pdf
    • http://on-video.com/movies/movie_data/file/mufubeluze.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607192be5f22d---62546988372.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/de5590836fdc5e62211bd438e30a1779/rukepabifogalut.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160affbb410bdc---28044662215.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d150c7372---19808781153.pdf
    • https://abugfreemind.com/userfiles/file/vezazepemujasigizovudu.pdf
    • https://muachungbaohiem.com/uploads/userfiles/file/74920790501.pdf
    • http://bscsaoner.in/ckfinder/userfiles/files/kedexi.pdf
    • https://bamfieldrental.com/userfiles/file/12728616201.pdf
    • https://tonwen.org/userfiles/file/bitepiwar.pdf
    • http://megalaserasia.com/upload///25093622661.pdf
    • http://seabeachthailand.com/UserFiles/file/26421023255.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/2s12n27clo7lj907n5jqknacnl/70345299301.pdf
    • http://www.emailposte.com/pictures/ketimixisimodi.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/r4rt3d4bdmlslrmqpne3rh9mo0/41017859557.pdf
    • http://villa-carlshorst.de/sites/default/files/file/96904286443.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f5ca5ee30---pafugadegazomisawupusamos.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b043648c375---zowaxezugofusupimejuk.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=do+you+dry+clean+wool
    • https://mediaget.com/userfiles/files/3376566678.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_off0000ec68.bin
c468682ebb2560d4356fe0047df12d5057e7c930c663181c1af503fcd37c3ebe
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 10308 bytes
font_01_sfnt_off000103cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103CD 16792 bytes
font_02_sfnt_off00011bdf.bin
584d3cab093ff6725720fb00c77c1284e2231297cd03952abf469f95981deb84
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDF 16448 bytes