Malicious PDF — malware analysis report

Static analysis result for SHA-256 66899b0728c5460d…

MALICIOUS

PDF

88.8 KB Created: 2021-07-13 23:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9c54351dd09562cf95dbe914844bd234 SHA-1: 2cfb1b433057eed7d5d045d14d19f3cf1c070ffc SHA-256: 66899b0728c5460dfaf9fb76f04b515badd162adba6a0c43b525eaab0ebd843c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings confirm the presence of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=time+between+periods PDF link annotation
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ah7r3v1u4l4e4qd8mia74otueb/mixekupimetajavap.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/gutodiwukefuxatov.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/98837166473.pdfIn PDF document text
    • http://aiaciran.org/cache/fck_files/file/fesaga.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/69ae8ca0b38cb2b49ff2bf2d1e8e940e/judijezabufepugala.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b8be2463b---vofupag.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/datewatozuwo.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/64703667858.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/84957905449.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/13a86113e71a9473f9fa7bc594da6995/54125257722.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/ferawonajobinetitigon.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d97ad0a3ae45c61dbff57e8a0bbe45ba/dawubeporixeserabawu.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/47778468768.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/joloxugatakowukoxinadufef.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/9065910364.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/tl2bnpaes9ord338jopg4rula4/1079065062.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/18991104997.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/bf7518553d5c3e38f33f63e60b1d5e53/jidezawolinijeku.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5eef6cb39---79282893103.pdfIn PDF document text
    • http://fields-on-earth.com/jexulusizinipili.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de23a8d31cc---gukipaletubifivesun.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3f5b2pnn53kbr0m5lu49emu713/18948241977.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/48166492820.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/48224022795.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_off0000f933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001114a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114A 10532 bytes
SHA-256: 91db1ff5793f878e407a29177ee5f2b93b1df7298b66278ff4584bbcdd7f7408
font_02_sfnt_off0001290e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290E 17228 bytes
SHA-256: 4aec46e93e0ece7f6c9193ec2536b0640c9f13a8e2ee9b89bcecd6e96ca8ac32

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