Malicious PDF — malware analysis report

Static analysis result for SHA-256 6372994347f00f20…

MALICIOUS

PDF

85.9 KB Created: 2021-08-29 20:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8edcfb3866a2ab6ca27cb6513be95983 SHA-1: ea93f5582b47ed339541062260cf3aaa1f377ecb SHA-256: 6372994347f00f20abe9b753af28890f1c90d929662b44d4e5149ff68080cb06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure itself points towards a malicious document, potentially leveraging PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://infrive.ru/uplcv?utm_term=the+two+main+composers+of+impressionism+were PDF link annotation
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/8d34dfe272b91fc1cc8035dac4f92d3a/japuwutuvipazamijaji.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/04414798f6effca93867d2873a489c35/23018807853.pdfIn PDF document text
    • https://aokman-drive.com/d/files/34306544913.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2cbae7080588f40cf5538e1acc03b357/59479172958.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/1lp1qi0rrtdl0t846oa9rclo4m/zuvaj.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/50868041786.pdfIn PDF document text
    • https://nicosiacaffe.it/file/98465463672.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/1e97a930c5739d1dd2cd2978794a18dc/16364657036.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/dofetoliwodifoxegab.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/2086932897.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1b1a590fa8f0eda20848e5f03eb70880/wubivativifovad.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b622322b053---13365695665.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7e6d4f4b432354588d48bff7453d2e37/16323784093.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/68755379311.pdfIn PDF document text
    • http://carszana.com/image/upload/File/topozowipuxati.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/29ee0e3e9eb6119dddeda6ad228a69d4/44152377035.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd66e9e5dc---15306819088.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/90000668083.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/794def5154df319fb66eb8d53c81cac5/35398949874.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fbdcf2c10---30395443870.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/pemixezoxotu.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/kufemuti.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609fabd95f13b---88798306340.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/kemudefidutuzotoburijag.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_off0000e6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 19288 bytes
SHA-256: 0e9864e899dc9de5ad3c619dc6f85b94af8f6a788e94f67128c74bc911757d6c
font_01_sfnt_off00011962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11962 10748 bytes
SHA-256: f038cd19b509dd2ae2c60dfbb1f9bc05c004d4e00177b9d4b1c0ce744d999d9f
font_02_sfnt_off00013205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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