Malicious PDF — malware analysis report

Static analysis result for SHA-256 4808ca90ba00676a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-06 08:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8174f2d99f601f71a0eccb9bcd298c49 SHA-1: 3bd1ba0f3c896bc4c653e3ef4010ae6111c25ea2 SHA-256: 4808ca90ba00676ad0e2cf6d2a100b68c4a45f170b327bf12cc55ea9644c608c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://smidgel.ru/uplcv?utm_term=important+characteristics+of+victorian+poetry+pdf
    • https://open-call.fr/uploaded/files/28780512507.pdf
    • http://otohondamientay.com/upload/files/lulofepeja.pdf
    • http://mdsalon.ru/img/lib/file/7292923104.pdf
    • https://pnlcoach.com/misc2/file/
    • http://beijingxinzhi.com/userfiles/file/20210507232820_1000602111.pdf
    • http://bjbtrh.com/files/pic/file/31217551817.pdf
    • http://partnerplus30.ru/images/fornews/files/golowugi.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/eiogn8doh5ubea20u11tehjuc4/54755432910.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/66957814720.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae4efbbe87---jejutuwelu.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a56e1267e---31341624856.pdf
    • https://et-auditing.com/userfiles/files/89295957423.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f802cac01---42448760039.pdf
    • https://topinsolventa.ro/userfiles/file/vorudujiwinanij.pdf
    • http://poltinik.ru/userfiles/file/3626429722.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/315d7952a799fe255c3f132c239267f6/36497808161.pdf
    • http://langeline.com/ckeditor/upload/files/22650725266.pdf
    • http://phoiinnhiet.com/images/uploads/files/gusaxiziza.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/b4i2rl3e9b4igi38pn3f9cnbv3/84416630417.pdf
    • https://detector-billetes.com/Imagenes/file/64363208873.pdf
    • http://turskazka.ru/ckfinder/userfiles/files/98729991976.pdf
    • https://boumqueur-edition.com/upload/fckeditor/file/13145834741.pdf
    • http://articolo17.it/siti//usr/foto/files/sovose.pdf
    • http://congtyvima.com/images/Download/82696012645.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6c359869e9743635dc7580c787ff28a9/matidevereto.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_off0000e0ee.bin
f19542b5025fa8de5206034b97cfffefeed30a2c5a7083053a69edf60533fe34
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 18996 bytes
font_01_sfnt_off000110eb.bin
1ced329aef8fa368f49e2172a9ba43404e4b2f366c4b5f0faa0e958e0003a72a
pdf-font-stream PDF embedded font (sfnt) at offset 0x110EB 10968 bytes
font_02_sfnt_off00012a35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A35 16792 bytes