Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f56592876a7240…

MALICIOUS

PDF

96.7 KB Created: 2021-09-01 02:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b45bc9c193530d2502c00f1ff0ed07a1 SHA-1: ed178425174f77f8cfd515536acdf972287bbe55 SHA-256: 25f56592876a72409b9c28655fe2b90eb30f7073272b853c94e844b508ad6aac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://coretry.ru/uplcv?utm_term=jet+lag+meaning+in+english
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/17862746382.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/2b645ed1ffa48ddf2371dcc1009d3f41/53121985011.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/8f1fa7624159fa800408422ab3ac32bc/powig.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160cca371a39d8---zunare.pdf
    • https://batikatravels.com/userfiles/file/nepilomedakujag.pdf
    • http://vizit-k.net/uploads/editor/files/83262254030.pdf
    • http://qiangka.com/ckfinder/userfiles/files/673933255.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc583e5c1c---2057446610.pdf
    • http://obkladlazby.cz/userfiles/file/23401812921.pdf
    • http://datavincity.com/uploads/ckfinder/files/27586674601.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7f79c761a---82989136971.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ilmoqd9s43bnp3sdts7p8rgp5o/pariwepinawuwugam.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/h5su4g7u7jjh3tl4ps94ach3g6/36929332467.pdf
    • http://babamoleskine.com/files/file/ritezamuxive.pdf
    • https://susta.vn/userfiles/file/9695748106.pdf
    • http://ufnk.fr/app/webroot/files/file/47726191516.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/dmsgcvsee2cc4m68lom0a4ej2i/23782593095.pdf
    • http://dawahcity.com/userfiles/file/91269382512.pdf
    • http://www.fonfe.com/uploads/files/xeneg.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/96911160783.pdf
    • http://simkoongschool.com/uploads/editer/files/1058593200.pdf
    • http://fotocaroli.it/userfiles/files/davoxulodemumegumujexajo.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/qqvupc2p849ucbi5slv2815j4h/bewesudagunetukekimo.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/71edd2875f9ecbed2793a2bb574784cd/22231228761.pdf
    • https://amthanhanhsangchinhhang.vn/upload/files/fepunapugulukezedadaveno.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_off00011323.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11323 16792 bytes
font_01_sfnt_off00012b3a.bin
f5e15fa5d4087d98ae0f83f57e4537892ed003eda3c34eb3bd48bd368678c870
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3A 10324 bytes
font_02_sfnt_off00014249.bin
3c3d0475e261a5875c6d205c7fec503a1ff1fa8d985a3daae80a08cc44b8e3b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x14249 18704 bytes