Malicious PDF — malware analysis report

Static analysis result for SHA-256 253228ca26665526…

MALICIOUS

PDF

87.8 KB Created: 2021-06-26 16:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4c757d4371c3561c4122a23933c920d SHA-1: 8c655d286fcee5f3b4f12f597b92a556da9b7e14 SHA-256: 253228ca2666552620240734442ee6bf705a603841886eff6b885da9b7aa1a26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate an attempt to deliver a malicious payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://smidgel.ru/uplcv?utm_term=articles+in+english+examples
    • https://liniagdanskzydowo.pl/files/retuxilaronezatowowaru.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b0ebcc0fc---mazeguzamik.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a35cad43b98---55210911318.pdf
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/paxesojabiwosisus.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/c188f9f77c54d78124dbc7b47f8800e9/fodavuxapobomovovew.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/7813798351.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/892612b0515a5cbc5bca0936e516307e/68526895459.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608119617733c---27664559625.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/db487176b21eb8bc1c7265e6927dc52e/velijefifamovekora.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765226930d5---zejewodusezujilivofimeze.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/4fcrupqvdl89cm66431jiiqiv7/89106570507.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcd006ac7a---63018495743.pdf
    • https://hoalavender.net/upload/files/sosejinetivajatav.pdf
    • https://muguet.fr/sites/default/files/file/99097860879.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609095c4d009c---70031572957.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bdb9be71cef872fa8d23e0dc2c31be10/nuxapovememekejonegoginu.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa418f9a3---pomijelo.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764f753e023---pewiwixosofupa.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e5763d36---73720816816.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1652e74e22---39900033818.pdf
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/52428890835.pdf
    • http://aftckwt.com/uploads/file/1947665642.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_off0000f2e8.bin
21721884771487b178df5b5b941fa7c6ee698657865d04d95747716a3bb8e233
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 10784 bytes
font_01_sfnt_off00010b92.bin
aac4869e2d65c6b881a521244d9733527301551efdc94b569955f05738e42c43
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B92 17360 bytes
font_02_sfnt_off000138b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138B9 16792 bytes