Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f16c3e1d4e0bf09…

MALICIOUS

PDF

87.6 KB Created: 2021-07-17 04:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cebfe3a1931b16df2de37990e0cff9c SHA-1: 7825761e891bf57e0a7157a8116b6283606aeac7 SHA-256: 2f16c3e1d4e0bf09b963dc8ca82b426e277f0aaf66f36d05df40e7c23df4349d
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 compromised WordPress sites acting as hosting for further PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these link farms. The presence of external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec1cfc56a9---30348595299.pdf
    • https://parfumzone.ro/files/file/walipizo.pdf
    • http://shengnabei.com/uploadfile/file///2021071708465511.pdf
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/plcaqdpodfar726mghv2aard3p/ladubijered.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b804ad237ac---wifomit.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b11aa4d998d---60397372607.pdf
    • http://mexvp.com/ckfinder/userfiles/files/62556943029.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/327762f4002afdefbd5127b2e61f650d/57869731326.pdf
    • https://securityguardsupply.org/php/uploads/file/fatiximugiwufexudosanep.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/b6a0e72f371364ce1de358044e41dd35/tixogezusorazedidi.pdf
    • https://steklo-shik.ru/userfiles/file/69931857217.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/i88n0pgp1l8vnfd2aibsej3io4/3176726481.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e335469773c100055d6b3245a6a00a80/gekabafabogiwi.pdf
    • http://ottotech.center/userfiles/file/20850221561.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/b7317f2feec1c1e714b968c3101ac25f/70135669357.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/0e5c5139972fa3d01a62e82764464f51/35234513414.pdf
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/6159740500.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608853e48a320---69975186494.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/e03190bae71c6fe426e9674facfb4de4/tukigaf.pdf
    • http://mai-colle.jp/userfiles/file/98572445344.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a90524aea---72816957107.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/4a9c23a28dc825937b45f00de0054f24/75383683775.pdf
    • https://sproname.com/files/userfiles/files/senezakabu.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/gofobovevera.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/c7a2e2047aa124b195556616b9c3897c/91874798851.pdf
    • http://fritz-fahrlaender.ch/download/peginofo.pdf
    • http://baihsad.com/userfiles/files/20210712_211648.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=assassins+creed+odyssey+ancient+tablets
    • 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_off0000f0a1.bin
94b2dc023be649a96d0bb5dbcc14a055bebfd18fdbda97bf159fb0d4f341689b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 17412 bytes
font_01_sfnt_off00011eaa.bin
9325903dddf6d12ef9bda88efa5c7a824696a0f8c3794500e56b47f2cb026db6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAA 10600 bytes
font_02_sfnt_off0001370b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1370B 16792 bytes