Malicious PDF — malware analysis report

Static analysis result for SHA-256 355bb64f3cfa2743…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 01:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 67a809e0683b4cfffcf2457f2578f421 SHA-1: ca48f35f6c238b98d259f0a196130c5594ba4c33 SHA-256: 355bb64f3cfa2743896076a49bb93598999702cb255164d58ed45c19d938f835
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of an embedded JavaScript stream further indicates potential malicious activity, likely to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=more+ringtones+for+my+phone PDF link annotation
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/09cdd522062ce7da5ad9757cae712452/11214677380.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/1347536256.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/xufekigogunoramoberojam.pdfIn PDF document text
    • http://asvpp.fr/pdf/75232685110.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c34d17f32---dixasasinewigike.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/faxosoxegumiwuwakofugowi.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/bawafej.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/19128518773.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/96112900580.pdfIn PDF document text
    • https://hot-pol.com/images/file/vizijasonusimelape.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/nujaxikujojutogunox.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109070455022024.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f3462ce1b6f6402754f40fc012209ed4/widur.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1e5246b10---turajobiviwiv.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/2050458612.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/jejak.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/57820224218.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/658682243.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cecd7530f0---36510928386.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/3416066964.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/2511937874.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/67964498515.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_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 10704 bytes
SHA-256: 7d6e7ab98d49eb228da694ea89ee98b7cd19b6f80d3e3eac7105e9be3f602809
font_01_sfnt_off0000fb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB90 17836 bytes
SHA-256: 5cfb87978ccfc532962d342ede9de555b6173d2931360d549d8813bb4cfce167
font_02_sfnt_off000129bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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