Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fb092f60bccfe6…

MALICIOUS

PDF

125.1 KB Created: 2021-09-07 18:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe8fc6f1e7ebfd526e8605efec0cbf4d SHA-1: 42551395ac5e98c5509dc0ccd52482b4be106df0 SHA-256: 10fb092f60bccfe6f911cdf0167600828254b613a4aa4807c51c911889b108eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of external links, many of which point to domains that are either unknown or associated with compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to phishing or malware distribution sites. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/powakigodaf.pdf In PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/3d7216c5af9e5ac26840133bcce4f28c/20784414610.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/40188548654.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/81671206279.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/67385216567.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/90983759011.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/45175787400.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/83941392416.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089541d88b7d---lomobedufolupewogilux.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a1016886c5f74a06535d6dd05fb74c5a/49635721472.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/rapuvanekiwus.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/55332054319.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093e97c8976d---24686655523.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a4d01893ef5dc60211e16be37453b6c6/17400117356.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac0fb79f237---jujijivazogepetetin.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16121ad8af3372---bokibagebezewegabeduvi.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/17012705876.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/bumuzulu.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/zakidegarupulenesum.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/54616485173.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/59669603699.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/1236379549.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/94221102311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=social+network+analysis+for+startups+pdfPDF link annotation
    • 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_off00017e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E68 11080 bytes
SHA-256: 40be37946b8e432c7cbd8f29209a36116240525a40a439e9e13bba4a94d9b005
font_01_sfnt_off00019865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B077 20260 bytes
SHA-256: 6527cd805021ed18eb4ece31baaeaa2e9619e36c484b12d8a04f2553edab5857

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