Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71af88205865947…

MALICIOUS

PDF

81.4 KB Created: 2021-06-30 02:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 762b1083d0e75c8b39caf70a07e060d4 SHA-1: 2d52d07fbb6bf6c9a820fdc4320d6561a7a6b642 SHA-256: d71af88205865947eabcbc6020b949b03147044db61074fbcd2069c20a642a15
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609491597160d---bipiwitakujap.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/7d43411bc94739bfca98092e1f746855/87266907553.pdf
    • https://arte-salon.ru/upload_picture/48212631960.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/69233328564.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/6icphehf2m24m2i3s5rnm9s45a/jezubebuxajojijanijumono.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/6835d7c56c9e8cafec9737ab8e1eff50/mololo.pdf
    • http://kartinatv.org/uploads/files/98326106453.pdf
    • http://mbcasc.net/imgs/file/54753264925.pdf
    • http://originalcheck.it/public/img_admin/file///xotuvifud.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcff3631166---pixunabuvukarulos.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/pju5dgpfvuc100kdh2kh64ajcj/leramexi.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/97a16841dad651768f0a9ee121db8ba1/98213222979.pdf
    • http://bearings-home.com/userfiles/file/sevor.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/613f693712f864758bd7696b007a9f36/butuxozu.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a4fb4b468584c483ebc8a844dde87225/74187548271.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/hk5hsh2vjpn7bag3lmdgj0r5t6/41351049546.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2419c4e3c---tisuxumujijujirevepamaf.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/b04e0d9d6846bc2df40c5583e030a251/dabiguxatopaboluwef.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160ac454d23a83---37177250292.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/labb10ghb70ivruoj4h1lovjl1/molim.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b483cf961dc---83984477736.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072205d17528---16336441939.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/b02238ba36b5b7b8f4248148c7797b83/51678698344.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609840fd349c0---banosabuwimejagidamuzad.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a7af283fc---30941785357.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c884b854a---jubesuxalo.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4ffe01720---dojifadalikikilobok.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=civil+engineering+quiz+questions+and+answers+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_off0000da7a.bin
890f5012313538156dc605e4be2d4b7ad24d46a7a7fc0f2cb914f73509df65f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 11160 bytes
font_01_sfnt_off0000f454.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 16792 bytes
font_02_sfnt_off00010c66.bin
2f91e3d09c8ee1058b123b2e12ce15fcc892d4c7143e81480e8ffa1e47859cc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C66 16732 bytes