Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a72143e2d7ef66d…

MALICIOUS

PDF

72.7 KB Created: 2021-09-05 13:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b764c1b572a829b3403eda7c6a4fceb SHA-1: 54fd845b6d083a424f039d8b97b38350e3d02eb8 SHA-256: 7a72143e2d7ef66d9c6cf7f4d28807396693fe72c266472a0c6330d8f00fee76
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or phish for information. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mocphatreal.com/assets/images/ckfinder/files/vuresetitusapaxuk.pdf In PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f9d8d2fc6---43773425435.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/bc72aaca66e2150be7934271fc626b09/rabowivegirijojewizudow.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/48923024727.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/8e3da1d1258c6036467cb36fdb989510/9899594602.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9ju3136pt9apa0if7ulnsptu85/morejaxudilipiparitinil.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/48267997672.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/nazetapuluxewezuno.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/roximudowiguw.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/diteba.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f8baed709---77819269434.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/10077972174.pdfIn PDF document text
    • http://webbuilders.com/files/file/59596975715.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/78397123493.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/xelopupikakopa.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/falutovozefid.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/ranamolomu.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/68950934046.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/toxinuwudoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=physical+education+project+on+volleyball+pdfPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/32252069866.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_off0000ba3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24C 15984 bytes
SHA-256: 5ab8fec99db4f2db80dab4d8dbd5e30fdb545ae3529a25f4970712ca4f8c9057
font_02_sfnt_off0000fb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4A 11268 bytes
SHA-256: b2a7bd75d157fb550a0725a7ce8be42f8d8bbdee56a3df61529ab9042b568a42