Malicious PDF — malware analysis report

Static analysis result for SHA-256 adcdfbb2cf239cc3…

MALICIOUS

PDF

86.4 KB Created: 2021-07-05 06:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1af1e7c8b4b1be8ea7436aa99aaf02e SHA-1: c57086390de85b1e2844f8a70684b8f6e0ff1c47 SHA-256: adcdfbb2cf239cc3a8e351cc2b5cc56faa63991afcf2d9b3dd3ea158962a935e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a link farm indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://busankid.com/webfiles/board/file///ladifo.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/e751e5f3943951e71d49016c7dbb4a55/gidovenomowix.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae4caede34---fadekurisojawo.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe5c655448---maduzalutofudik.pdf
    • http://euro-ex.net/images/blog//file/8595700600.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac897e9c1e---74748485641.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09482130c7---levobijajutepegisuxo.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/530ede7d151dbcbd03a4fe4a98b3bc9b/gumimegitezuxafanuxoxazaj.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/9acm26q3519l8tocomldaidl08/58086164627.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/1915272df84b24e1b853062202ce12d4/bitukilapafa.pdf
    • https://alianzatours.com/imagenes/file/kulotororujunadoji.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607df3ea04942---tojaroriwige.pdf
    • http://popnmusic.fr/userfiles/file/gamujavexosujitumenil.pdf
    • http://ei-windykacja.pl/upload/file/lexadijajawenu.pdf
    • http://moto-bike.pl/userfiles/file/93064901733.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/7dc236898b6548ffd51a492c1a974ed3/19991768066.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/5rnhsc08k3uq5kv4tpftsglvb8/xezikupabawiso.pdf
    • https://daiichigroup.net/uploads/news_file/wogirafojinumemaf.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608751b438d58---15507978456.pdf
    • http://nesthomes.in/userfiles/file/binezaxejipapezivagurak.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace94e468ef---ninekerajupipoluwebugim.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e5fb2ab9c---60804078640.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608059e1bdb85---lapurirewusipebakule.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cad02ae6c---xanomabi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=your+recycle+bin+is+corrupted
    • 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_off0000eea9.bin
7be42b88926883c6ccc927055b6c89dcb8c63317cd5066875c199078efade029
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 17280 bytes
font_01_sfnt_off00011c0a.bin
fa7a7a4cbfc44742719e8f89994dca0fdcd62106df7716a8d3e1db1cc5cc6949
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0A 10680 bytes
font_02_sfnt_off0001346e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1346E 16792 bytes