Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa314b3618c5fd03…

MALICIOUS

PDF

80.8 KB Created: 2021-08-01 15:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 4c52e5a47bee534eed76d5dc9235af70 SHA-1: a7dc55eb6d873201d2d619471e848b2d147353cc SHA-256: aa314b3618c5fd03869d91c52947d885cc2c00b3939e189176a069eed09db1f3
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7c12389f6---39522171608.pdf In PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/krf7fsdupo7tlmqljcousin1t3/48027449046.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/bf67d3207e0725d08716895438ddb64e/bevolewolubela.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a0ad2fa4f---jasezozuletitisexobumoba.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/2inu2vhgktgmolpjvqvmpd55u2/14178945035.pdfIn PDF document text
    • http://ndt-ultratech.com/files/tasefeweleriseretiw.pdfIn PDF document text
    • https://sambelteri.com/contents//files/baxofugo.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210612130410.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/hoa1eeabuaqfi132p8rq68bimv/betopogi.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/k9vc4i8rol1u21sam2vb7tt4tm/76185866479.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d0cff3f8c5be513d6519d12666f5e211/dubasasegite.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/winovibopilexukopunuxe.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/61346935551.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/c98b420471d2082722148b1c7d28aa6e/35121164087.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/gugalagubefapi.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/3cfd214f09e2091da31c077ec470a979/fubolezesenifepesidoto.pdfIn PDF document text
    • http://rapet.hu/files/82878609728.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/iuuf5dura55bbcu07pmoqpi8q5/19238820680.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b79cc4e0b57b3e03e74a7a64bfa69176/jubomuseta.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/25451647436.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f751db25ac5---54160902783.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/tijaga.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/nezivewesomumodawizi.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/f872f4e636b33850ba697b481eb25601/11526920315.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/iaj3vu4temd3i57hvitm25avv4/wuwamilewo.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/02b4eee283caba48bb2379bc790c73de/11640806600.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/pejuvanibaruforuwapana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+hunger+games+2+download+in+hindi+480pPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 17288 bytes
SHA-256: f8023282519f312b37ba9eb4790c6023c9c56604aea3b7ce8aca668ce3452642
font_02_sfnt_off00011a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9E 11420 bytes
SHA-256: 227b350333bb7d618ab2ac1e139454ce521ba3f322513e1939f579dbb02e15c6

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