Malicious PDF — malware analysis report

Static analysis result for SHA-256 89960577c99cef41…

MALICIOUS

PDF

72.4 KB Created: 2021-09-25 10:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dff7425493681018ea6e0ae9ec4453b7 SHA-1: aeb05615f9d92913c0847b24cd2d2016debcf763 SHA-256: 89960577c99cef41a284c36bea9bb0857968d463bb0ddee3583a69ec9b260311
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised content management systems or disposable hosting. The primary purpose appears to be directing users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=how+to+detect+a+spy+app+on+your+phone PDF link annotation
    • https://cottonweb.net/userfiles/file/pesugolixutude.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/15dc813a04c882deecfb844dd28ec1e4/rabunasij.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/numozebarojefa.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/56843049333.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/viwuju.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/89666623580.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/walewujofanapalame.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/pajejibaninemefegujexo.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/58002506144.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/pemoxazu.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/40031987365.pdfIn PDF document text
    • http://centrons.com/uploaded/file/167329275561364f50f14cc.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/13855070403.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/41600117897.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/54154631836.pdfIn PDF document text
    • https://endobible.com/userfiles/file/bavipuwefagomuj.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614737b1bbb8a---80293468676.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/27040609378.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210901063142_29g6yg.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/36495556997.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/32594107570.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/39354643157.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/lowufosikujodum.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/vogaselorevaxi.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/da2dd5b3de36d08f11227f8d0bcdbbc6/88291401305.pdfIn 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_off0000b7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C1 10764 bytes
SHA-256: 523533136673f067bbdd109c9cf6e6cf28849278f2a938216fd882d0cea6bbcc
font_01_sfnt_off0000d07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07B 16968 bytes
SHA-256: 2b14a2e35696309c5cb4723421de20dbdd3d0380c6bdb0af3108097e7fb70ced
font_02_sfnt_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1