Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0648d91b186b14d…

MALICIOUS

PDF

69.4 KB Created: 2021-09-29 11:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edde62a9a1b7754ad0a81e10792f6a81 SHA-1: 21460a074deb38119b93408c30f78b9acd4139a4 SHA-256: e0648d91b186b14d6268dd45c8520ef22131a24f060af6cdce22538983ee6acd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised or disposable hosting, aiming to trick users into downloading software. The presence of external URI heuristics and link farm detection rules supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://amirafouad.com/uploaded_files/file/59368216907.pdf
    • http://www.prodomasa.com/ckfinder/userfiles/files/54950561808.pdf
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/96541214995.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ce3ea4fe6---39309887529.pdf
    • https://polnische-zaune.de/userfiles/file/xebanuluvofasuv.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153b952b5afc---rexipifif.pdf
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/bikeroviwegizovajiduva.pdf
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/27817326283.pdf
    • https://ribaczpeter.hu/files/file/51921169063.pdf
    • http://numere-mopede.ro/mm/file/jibosemipenevula.pdf
    • http://tourhong.com/FileData/ckfinder/files/20210901_EF38E1CB83B9DF1C.pdf
    • http://ciccioinpentola.com/userfiles/files/92664074678.pdf
    • http://ty-int.com/files/files/29821889195.pdf
    • https://motiwalainstitutes.org/userfiles/file/26455844062.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/656d90857f062805d45443c0939d7e95/zuxugibirasanatijajilage.pdf
    • https://duhocblueocean.vn/ckfinder/userfiles/files/82783640911.pdf
    • https://dongphuchuytai.com/upload/files/vefijafuwuti.pdf
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/74960691220.pdf
    • http://softtox.com/new/userfiles/file/kusafanupukofix.pdf
    • http://fpole.ru/sadm_files/27194551939.pdf
    • https://dragonexpressml.com/userfiles/files/23590613354.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=minecraft+pocket+edition+free+download+pc+windows+8
    • 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_off0000ab84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB84 16792 bytes
font_01_sfnt_off0000c396.bin
fa8c42421b58308c699b617cc43fb0fd150ddc0107b671c5dbeb2c1f064ca857		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC396 16048 bytes
font_02_sfnt_off0000ecb6.bin
2ec77fb8bab39c145a14310ee397ba15ab2e24231a8c45662eb544b71078bb19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 10992 bytes

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