Malicious PDF — malware analysis report

Static analysis result for SHA-256 929cc850bfb91443…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 05:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 31509061657f26934bd2182b196bde68 SHA-1: ac23ecbd5ea979176529cf25ce6a48d816d2cde4 SHA-256: 929cc850bfb91443fb809be4434a6d7945e870673b3d0e7efa966bf4f9c4d49d
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS upload directories. This suggests an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hotelite.in/userfiles/file/75888094303.pdf In PDF document text
    • https://qian-ho.com/upfiles/editor/files/61699532140.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/bujakuvipetosa.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612efa7b2cfc2---kokedopizasimagox.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/40286099658.pdfIn PDF document text
    • https://cargobull.cz/res/file/jozop.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/kemimubevopixagaxinabupoj.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/52012476708.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff052db9c8---tatagirekeketulepizopojod.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/2200717024.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161458536daf8a---zirudizasemojetudavodub.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210919063044.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/18876722237.pdfIn PDF document text
    • https://whitesal.com/data/images/file/2082_20210912215744.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/19022743268.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/93042654897.pdfIn PDF document text
    • http://rotang.net/userfiles/file/japekazefipiduwarati.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/fafobunevuzuwezesu.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/76132317237.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebc93d9f47---lufupewe.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630988944_6669cd3d4c.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/54545979639.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/HAdJOMQPnuo5.pdfIn PDF document text
    • http://zeci.nl/im/image/36701830608.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/96115628352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=i9300i+custom+romPDF 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_off0000defc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 17188 bytes
SHA-256: 5fe5e091dde6399b57ced14a831a1ef349a160bdde17a8bb06439ab6fe973d12
font_01_sfnt_off00010bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB2 10460 bytes
SHA-256: 216540d75e5a7a1fb36f51b540e381e22ffa055e201cd1182b1b8234ccbed367
font_02_sfnt_off00012385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.