Malicious PDF — malware analysis report

Static analysis result for SHA-256 5adbb5db5e7ec031…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 00:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1da48b35d4383418c566384ce6c0a04c SHA-1: 31f1c28da1311f30ca8fdd61bdfa1e07a80a5318 SHA-256: 5adbb5db5e7ec031bca37c2a7c44e02231f87b439d6281b0d061dcd0f3e44cc9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing or malware sites. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

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 http://www.asslar.de/downloads/9506865266.pdf
    • https://ayurvedaemart.com/uploads/file/gotebidofidabawazutus.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/2bb95921f605c710f5fad20624a0fe55/40968737398.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/7d7ef302da7672d6721086f96f688df0/jitobamofulavokewodeb.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/02ff8c9c2e00473905d632734912f8df/bopulobizapisij.pdf
    • http://bukharaatlanta.com/sites/default/files/file/81129654563.pdf
    • http://dirpub.org/editor/ckfinder/userfiles/files/sukimeveraraf.pdf
    • http://augustaelectricalwork.com/editorData/file/70118649137.pdf
    • https://chongtham68.com/app/webroot/uploads/files/ganewudivodoguni.pdf
    • https://thehideawayresortpattaya.com/userfiles/files/40884107140.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/c058890ea3d591ef11182797d4d8756e/nuganamabulox.pdf
    • http://duszek-lasu.pl/userfiles/file/fidon.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/winirozip.pdf
    • http://curry-box-deluxe.de/userfiles/file/72121066173.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/0atl79jjhphnsk0jc6sqn0tu76/bunaxutogenajukokaj.pdf
    • http://xboxheerlen.nl/userfiles/file/zofaripazak.pdf
    • http://brlairport.com/images/file/65625360913.pdf
    • http://thomas-zigon.de/images/file/70783058951.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847504ed076---33903822469.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1311c879af---15880568634.pdf
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/kibenagabovapulen.pdf
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/eod6n12jkggrkbarsdgdlk5ard/bawajapunowu.pdf
    • http://orderkiwicafe.com/uploads/files/kepodadifopewamalifudukiv.pdf
    • https://excore.hu/ckfinder/userfiles/files/56658252173.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=putin%27s+russia+book+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_off0000e1bf.bin
cae7fbf919b0423e33b7152c2b3b0f82f934c1eb8375890e891d55dfb11930fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BF 17624 bytes
font_01_sfnt_off00010f91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F91 16792 bytes
font_02_sfnt_off000127a8.bin
b4d9b7b73da39d4b94c11942a48556cc5d03bc00200c3600e264ec300440715c
pdf-font-stream PDF embedded font (sfnt) at offset 0x127A8 10680 bytes