Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4e2d246c5bd3ad…

MALICIOUS

PDF

108.5 KB Created: 2021-06-26 07:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8afd9dab4b850618a58e9d85ae5b0827 SHA-1: e5e119d0b656ea2686f3cf403a6198ae1a3133f0 SHA-256: ba4e2d246c5bd3ad51e5ca18c3e6f5d551d92dda1972116a4cb769762065cffb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised CMS upload storage, a common lure for phishing. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a technique used to bypass gateway scanning. ClamAV detection and ML classification further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd08d77ee19---1201691481.pdf
    • https://ludifrance.fr/userfiles/file/jamexofupikoxejavufi.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2ef58c509a4bac4987eadbf8e582da7/pomemizewimexasubi.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/liriretepisufi.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa3db836e---35545602812.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085b69895aae---8888495258.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084dc29c422c---nogufiredasuduvalurojudix.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/3ohl1vtnh9e7tviai7j0hgc0t5/70497107772.pdf
    • https://bacninhonline.com/webroot/img/files/61603636671.pdf
    • http://lab4050.com/upload/editor/file/bidiviwifurumomuvi.pdf
    • http://schokoladenfontaene.de/idata/wefujopa.pdf
    • http://alphaconsultinggroup.us/vpw/images/file/norejamidaxuvikimawu.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e16fcd1b4a---56814923402.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073df310254a---88698386102.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608727ff6ec1f---71826140914.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160770acd0ed73---35032893699.pdf
    • http://odpadykj.cz/UserFiles/File/faxoganixadojezem.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/0b0a961f18acdc5a7b124fe005203539/2571917096.pdf
    • http://keralabiblesociety.com/fck_uploads/file/58408212416.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e683f582c75072b2f78458c49018f19c/losaxufapas.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3015bb0982982b4f4fec243cb1460c67/13414558472.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/efacc400cc27756ecebeee1f8e615f12/voxitulaxobudu.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/76fac53a475e487b49d9a4df7847166a/83979100369.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/1177f86e57292ec3b34651c250bcc47b/tolesexago.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/ed08f96b5b6e08faeb1d2bf479a41602/13988815976.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d3479f3ac8d7c31d3e8f3ead67716562/ginikarevugisugegaxijuri.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=define+structural+ambiguity
    • 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_off00014708.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14708 16792 bytes
font_01_sfnt_off00015f1f.bin
59913e3a04f674285bd10ad8f1bec310aca16791e040f0816e051439080b4c75
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F1F 10916 bytes
font_02_sfnt_off00017878.bin
76d321020ced5fd5443c730a6b20ded35ae5949d6a82160846e4e4eb17ce1ae1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17878 17044 bytes