Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f19c51f384f0d2a…

MALICIOUS

PDF

86.0 KB Created: 2021-06-27 05:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cce36f86a71a12f7eefea073d26b6952 SHA-1: 2cf934b1766a29264f9b68174a1eb55e5d9be38d SHA-256: 4f19c51f384f0d2a885930a32e2b1f811137929b09a020fded4e77dbba4cf495
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://luingpyrex.cz/foto/Image/file/kezubobum.pdf
    • https://alianzatours.com/imagenes/file/16947293446.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/c1fc0baab11d60e6dcb8607c417c2d52/gotoxugukifapaku.pdf
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/34835709771.pdf
    • https://juniorclublivorno.com/sitonews/images_upload/files/16492930389.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1fb5afea6---gatikapikadasegodi.pdf
    • http://agendaalzheimer.org/files/galeria/files/44449759150.pdf
    • http://rotarylaspalmas.orgdocumentos/file/53024686503.pdf
    • http://dunajecbiala.pl/upload/File/22095996911.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/76e3174bd0e74cd82833e0794da1f94e/78048603557.pdf
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/wikakatezoxoj.pdf
    • http://poltinka.ru/userfiles/file/javuxawiwuzusawu.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/0e8aaa06c8d0d985dde6cf6e07477994/86867253991.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085659208e69---19605945137.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608336b5c4b3d---fezefolevorarepi.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b32058ec18a4a50752d57e009286f18c/terenemofasififubo.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f8e1e7391---8722956462.pdf
    • http://firanywiktoria.pl/uploads/editor/file/16639646574.pdf
    • https://lionkingbali.com/uploads/file/bumubiteba.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b21af72c9e5---dugulepudavusaxaxarip.pdf
    • https://dm288.rs/slicice/file/16244743464.pdf
    • http://centroolosprato.it/userfiles/files/kafip.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080ee8520580---temoxonaromitexaraduniwig.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=apa+when+to+use+italics
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 16792 bytes
font_01_sfnt_off000106ab.bin
b93d0b28653ddd8bfc4589c9168748ac4ab2c127745543aab25cdcf0edaac4db
pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 10540 bytes
font_02_sfnt_off00011ec4.bin
46d4efe6ef1b7b5075a5cd3f0b9b2567cc746fd96728c4eb61aaa07ae68a9680
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC4 16952 bytes