Malicious PDF — malware analysis report

Static analysis result for SHA-256 2735d3eceaea0992…

MALICIOUS

PDF

76.0 KB Created: 2021-08-28 10:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c2648999652df8dd850bffbab5b4f52d SHA-1: e456995f4d1c442f5b3ee7bab50460e707fe7806 SHA-256: 2735d3eceaea0992fec07538e6cb394d093a9dd76e43f6d9181d03b2df260057
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to disposable hosting or compromised CMS upload directories, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dpsszczytno.pl/photo/file/jamikososa.pdf In PDF document text
    • http://salamino.pl/userfiles/file/jifenivesozodepefekitoto.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/0tlh7s0gs92l5q3fls6a4t2l8v/98708175696.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/feposovek.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160ab049a48ae8---ritibipabulevewuni.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/dawuj.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/kuwolid.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/sk21qunl4m39a1v0mhjmg7ts34/39275816478.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608381f4e09d6---75758275392.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c46e6758835---gowariwulujefowalebefubis.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/kebadid.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/3bcdda5e0dfdb4048673faf37805a784/50125722488.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/nozuxotiweporabesujike.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/mijarozetan.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/sogagade.pdfIn PDF document text
    • http://tipiland.net/upload/file/xanibigu.pdfIn PDF document text
    • https://kopari.hu/files/file/zejena.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/35711368063.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/9d658c7726474802ce840c4d563d0f56/gojomajituxitilejabuves.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a8065e63fe---94818364613.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aacfd4b3987---wogukeninemebisume.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/csr7utbkt3q8o7numim9gl4mu2/xabadoj.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/9408530908.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/lorufativubazulal.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/mrh6cdvhjbb3s08qb2vu1p14p5/28349629397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=device+management+in+operating+system+lecture+notesPDF 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_off0000c730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC730 10996 bytes
SHA-256: 470a0ff9db05d36e28327c16c614c4698353dee46b370f4f757bf96ed09eefc9
font_01_sfnt_off0000e0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 15892 bytes
SHA-256: 92081c1401773415d11d8a9a191f2aa4cf156ef0384bed67ed3445b1d8eb60b1