Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9ea551d6a7751d…

MALICIOUS

PDF

98.5 KB Created: 2021-07-04 20:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7914dbfb6b0bc7c94f20a6f858654581 SHA-1: 497cd4f13a2aae8e0ea53904e2758db8cbe13fba SHA-256: 8b9ea551d6a7751d90b7f62e440ab921c6a9173293a297cd24bce663cb06ffde
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript, though not directly analyzed here, is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=crept+meaning+in+telugu PDF link annotation
    • http://ddrwc.net/clients/869849/File/zemibelofifemibara.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160808ba1cabb3---96670246262.pdfIn PDF document text
    • https://dhesient.com/media/kakilexiwulefuda.pdfIn PDF document text
    • http://darienhigh70.com/clients/878490/File/timowenesadudamaxinenu.pdfIn PDF document text
    • https://susta.vn/userfiles/file/82224182537.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9095543bc76fb55778f13c32918f9a7d/44309303085.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c07a96a387---78282494740.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a31b803f8a8---tifaz.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e05d4f4aa---25346391674.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/2c2fc1c290e4688e94f4971c780cefb3/52202990806.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/qm023qovi1h0juqdgprrlhvpr2/5320795208.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/1i3254tgjipiibst255fgub6t0/zidedavasamerepajed.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ed1cda4a---20117685844.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/fapirevamoruregopovojo.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/gcnck8g3j521m10qr9abqq24jm/77226918813.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-6/20210606020917268718.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/77812440057.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc65321212---48265963109.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/pokokuzamimamimala.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/37374974959.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9a06d88f7---taxaviropatepi.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abda1fcda0a---gaxozesarafibaxazifik.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_off00011810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 10440 bytes
SHA-256: cb33daa329b6ce8ae3c9ca8197f5383be756b41657f7c9f5af83c7fd3318fb95
font_01_sfnt_off00012fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAC 20024 bytes
SHA-256: 52a55c122e083b808296f43c73ffdfdd1b107df9b65916312467df0d873e26a0
font_02_sfnt_off00016338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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