Malicious PDF — malware analysis report

Static analysis result for SHA-256 075d487fd8a126bc…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 05:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 459d2c4ef855a67ee03c17476f413a28 SHA-1: 034b7c892e90e1a27cf71558647a411d46670df9 SHA-256: 075d487fd8a126bc3296366637a80286ef4dd8ef217198195b22402dbd6e214c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or appear to be part of link farms, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the conclusion that this document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=requiem+for+a+dream+book+pdf PDF link annotation
    • http://etenindex.nl/images/uploads/gebin.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/47ruulnd4cl9o5qsr5dr890dc0/gokotorijufezotex.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/871566077.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/deneturizasonuze.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/sesojelupipuxonurasovipa.pdfIn PDF document text
    • http://mweb.cz/images/file/gazok.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/xamuxoji.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/loferoditunepaxizerak.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/guvurubopexin.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146cc006ce58---41372586083.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/57648341262.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/79552522072.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/aam9ehss5tcjjf05ncnlur2k82/kezuramuzovikisitina.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/26756395537.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/tezovuzolum.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/55823568098.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/81590479984.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aba2dcfebb---gejoxido.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/fumugufedewopowug.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/99108923824.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/lagaraxabe.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/93556200184.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/daweraw.pdfIn PDF document text
    • http://kebirbeton.com/userfiles/file/54507605284.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_off0000b154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB154 17144 bytes
SHA-256: 33af56029b95b6d03686b40cca8ab623757ec4830465c8c0c222e16218e8fb0a
font_01_sfnt_off0000dcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 10768 bytes
SHA-256: 8d39776cd1d4e9a4f65510b8abcd4bad955c4d5b913dda866f22038e262736f4
font_02_sfnt_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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