Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8505778cfe6848…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 12:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc4d2c3dd012434f352bf20837b21ac1 SHA-1: e1352853702af104dd125496ace16e1008508574 SHA-256: ac8505778cfe684809aa73ef9036aa48ea48768a49f559851d166fa5402c3eaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that this PDF is intended to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://synerhu.ru/uplcv?utm_term=chinar+1+english+book+pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081cc049db4f---14319182769.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099aea5c5e9b---29949457025.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099aaf5465b9---batobukadiz.pdf
    • https://eyetracking.pl/userfiles/file/ramidekukalu.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8509ec9833---weraxogesariwodusabigimav.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b82828cbf---51325463379.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/665510010bf79c1aaa087668981fc6c0/zutupakusezoke.pdf
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83557445867.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862e63a9ec7---bojulivazudazufiwini.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/15a0d23e81177939a97aa24a604bfde6/53565979272.pdf
    • http://www.urbanwaterways.info/files/19788713480.pdf
    • http://kimandyoo.com/userfiles/file/muleziwijalo.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/6eaec1ab42130cf6cac1c64a0f27c78f/41760702331.pdf
    • https://angkoronetour.com/userfiles/file/78004359620.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161240d8c9b77b---xegejaba.pdf
    • http://cristal-in.fr/userfiles/file/48064677367.pdf
    • http://mkbeauty.vn/luutru/files/xabemufinitunar.pdf
    • http://sahamit.net/userfiles/file/xuperorinowebinoki.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/39d6451e7215297207724f13504c0202/91265174529.pdf
    • http://24cvety.ru/upload/files/56399808928.pdf
    • http://velo.hu/UserFiles//file/lidujibafizijebopo.pdf
    • http://www.hussco-steel.com/husscofiles/files/zetifokekanuforajetenatil.pdf
    • https://theshamrockpublecco.it/file/7327521912.pdf
    • http://scholl2021.com/clients/1/19/19bca4f76d5065ca3bffbfc1c67e7925/File/43334928676.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_off0000dd8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8C 16792 bytes
font_01_sfnt_off0000f59e.bin
d06084f1f9814b659c4aad30edef4851709504b20db811507687ce5fd78540d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 17976 bytes
font_02_sfnt_off00012444.bin
bc5d558a8337c71c0370ca16b9a91e8e6ec13f6ac7e11dfcd23c7a87dcc745d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12444 10992 bytes