Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71aa17a0042a68f…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 09:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1bd1cead905270c09e44966d8c8157d8 SHA-1: 22a6c2f0e2cb93739094832a2657256019187bac SHA-256: f71aa17a0042a68ffe1c4367de0ae04639121efb1fd6419c26410bd3bedc8ca4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs, while some are marked benign, contribute to the overall malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://medrea.ru/upload/files/vutuseluriluzaridizebajek.pdf In PDF document text
    • https://promise-land.com/upload/file/32782786658.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614045b74782c---31287130993.pdfIn PDF document text
    • https://kultmotor.hu/images/files/lorasugokefebiledaliluz.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/pumomedarisateliweb.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/lofev.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/5778694260.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/nurudeja.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/lififakubufujolezipopu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/06d0b223e255c7df879c59f016b4d0bc/rasopuwudunamizivip.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/cfc830e231426b0daf72e2e0382c4072/jovopapesavafeler.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/70428998898.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/92683299168.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140f49b534f1---39879654039.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/zejes.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/3809536531.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/sogowuriminovikimosuw.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c91a715315---zawivomobezaneje.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/nazexik.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/6464127360.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/towojozuvoxi.pdfIn PDF document text
    • http://hjhchem.com/upload/files/lelufugatig.pdfIn PDF document text
    • http://www.fotolia.com'&gtIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=convert+3gp+to+mp3+androidPDF link annotation
    • http://www.fotolia.comIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B6 17700 bytes
SHA-256: e762a282f92a6c2ac520e3372dd2508ab6a15962b9761081180ab37199be50dd
font_01_sfnt_off00010efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12715 10792 bytes
SHA-256: e8bc98f121001cc8c54d47f832826c4d74fd639ac0f1bd57b03a1e4178566c26

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