Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8b8e2ba4ee2a7b…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 13:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c96a6f267201a5a55090fc2d9c8b505c SHA-1: 659b19024226cdde57b206a72a7a680ded17eff5 SHA-256: 7e8b8e2ba4ee2a7b4f0611dcbb93a6ac4ccb959d41ec66ed996dc3555cc7c693
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://kabaretyimpresariat.pl/Upload/file/benolijezijesij.pdf
    • http://autodilykanka.cz/cmsimple/images/file/47125094433.pdf
    • https://bold-iot.com/uploads/files/202109240228544458.pdf
    • http://morakothotel.com/file_media/file_image/file/lesede.pdf
    • http://baocaosudanang24h.com/uploads/image/files/24141158768.pdf
    • https://perfectsextherapy.com/public_html/userfiles/file/67871749651.pdf
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/59336366724.pdf
    • https://simbhaolipower.com/images/file/nonegibu.pdf
    • http://varosom.hu/userfiles/files/wuwaxazobekusavopuz.pdf
    • http://lachambredechos.com/userfiles/file/naxefumapise.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9e91c118b---88707651202.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d51c83b81---xukadomabe.pdf
    • https://dbjadow.pl/attachments/file/3854942879.pdf
    • https://cuatudongnhatrang.com/uploads/files/33773711178.pdf
    • https://eccdc.org/application/webroot/userfiles/file/58334681750.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-9-19/20210919184503544241.pdf
    • http://plechotice.sk/tmp/file/56083344741.pdf
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/bagigifevifeserupub.pdf
    • http://nikkenj.com/userfiles/file/wejejibilowutewe.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/kivopuvaledelop.pdf
    • https://absoluteanytime.com/media_file/files/files/gaxelujeleligititapaj.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/n7l2med25scr5cdfn7ccsmf61d/86898027187.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/sqfs57ficjerqv5h5mn5mrhg2b/21623187120.pdf
    • https://adepotcustom.com/UploadFiles/file/20210906180315149.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-9-8/20210908175302676653.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/13d305d92730cd6acf722b6e5b68b838/levunuwesolugowukofugo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=short+stories+for+2nd+graders+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_off0000b328.bin
41f19ee3c466bff4ad82ec8f00c34bbcc6bcb2efd324e06bebeab93acf36f5f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xB328 10924 bytes
font_01_sfnt_off0000cc35.bin
7d4643cee5695aa435670a66f863f7d6b9060c0458890deaf02ed35471c531c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC35 15008 bytes
font_02_sfnt_off0000f254.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 16792 bytes