Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef8e4059ddfa5a7…

MALICIOUS

PDF

80.5 KB Created: 2021-07-16 08:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1bb5d98286e39efda5977c66431db5ac SHA-1: a3a95659a8b955c4193fe6e79f9e89cffee3e6bd SHA-256: bef8e4059ddfa5a7879fc60cc24ea53fd39c28b49af833666c21649f828399e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised websites or disposable domains, suggesting a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to host and redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://smsalumni1971.com/apadmin/uploads/userfiles/files/vuzixule.pdf
    • http://bestbelly.org/content/files/files/fejewiregobudesu.pdf
    • https://charterboatdeliverance.com/uploads/files/28455414815.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2f5aca662165cde2fc4c04261433f66d/60009511789.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f3085c00b---90355197063.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/jj56go4lvlcmlrmgk6h32g4id5/zefapex.pdf
    • http://parentini.it/userfiles/files/50834390694.pdf
    • https://familienbilstrup.dk/ckfinder/userfiles/files/pasekovit.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e9d075bec---sopeluwogoxego.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609422a7e88dd---51371595214.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2b9059b51ddc466dc760b2a3e77b5bc5/6297739202.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/59897299294.pdf
    • http://shsclassof1970.org/clients/872719/File/lumiwinadev.pdf
    • http://biotledlight.com/userfiles/file///guwewidavodalazemataxun.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/uucmp7320hi65pp1klqbqj5s1p/92352695088.pdf
    • http://abacusnancy.com/userfiles/file/vonovusotezazokode.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/jto2ha1svo7eq3bc0t247cdvp1/68322494688.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1d7e78907---xugojipodeninisij.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a3d8df8e0---94565369888.pdf
    • http://chi-kara.net/userfiles/file/jenivanikaxibunijusisaxe.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbf45208ca---netetanovezoranakaloga.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe1fea358e---bazipudiwawijiruzuzi.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0bdfead26---fekubexisuwokanowiva.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=dynamic+memory+computer+course+book+pdf+free+download
    • 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_off0000dab9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB9 16792 bytes
font_01_sfnt_off0000f2d0.bin
6be9235b9d5ba33e81c3b2c973a897a4873e95f6d7a15b3f22d6119a66012c1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 11316 bytes
font_02_sfnt_off00010d46.bin
8c888cf23f415b5e1ace325a584695eab482a90696c462ec2d7fb6ab511c4eb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D46 15488 bytes