Malicious PDF — malware analysis report

Static analysis result for SHA-256 abfda5989e7edbd4…

MALICIOUS

PDF

85.3 KB Created: 2021-06-29 15:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ddeea27c555491f7a0f8e4a1be4093a SHA-1: ea846058087db3ccef4014c056c0a142987c0bff SHA-256: abfda5989e7edbd4b38e3282a66eeb2f333e084ae8ec352f75f5c31cce639076
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to PDFs hosted on compromised WordPress sites. This behavior is indicative of a link farm designed to manipulate search engine results or lure users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/37fdbaac56ab2c7668b190f23f0f69a6/lobikezabukibafonexavisax.pdf
    • http://staractivecollection.com/resimler/site/files/javifubepiwumazilopixex.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/f22fcd28b962a437317d28c61f457cc6/womadasasadibubarar.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c5ea90d0---fidajifebazimumipedibaxis.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086e28aa34ea---81188131746.pdf
    • http://eortak.com/img/fck_temp/file/76236255826.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/safebubur.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160929309c886c---37316116192.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/0554d4311f42d4bb5d967283f2a17c05/64764781151.pdf
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/97367141664.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/254ebfd4528fa90b89dde0b00c782bea/wiwowapeso.pdf
    • http://igorodstore.ru/files/userfiles/files/99709630026.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075c60a5322a---pefuworelozejawoxekososov.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079160f3293f---nirudalipebofez.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/o6p4rphla3fcdr89umjivgo1q5/lijekaxu.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a090600fcc3---donosikugubamuvemarole.pdf
    • https://actorconseil.com/files/file/ketolewiraparavutufamoz.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/qpa46a2d8r9lcsbeo6ftghb3sr/57798975334.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/8672c18e75377d5c388c40ee6e47def2/nokowino.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/44bcf49abf4a96c899c2f1e2b48c0f1c/94101772227.pdf
    • https://telewebmarketing.com/FCKeditor/file/sidujonukedigarolevisofol.pdf
    • http://jjinline.org/file_upload/file/pekewipamuged.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=lease+amortization+schedule+with+residual+value+excel
    • 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_off0000e577.bin
1296cb4558df77db79b5652f08b390a3d3a70b746b5592b1abd7f3c4e0fa2224
pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 18768 bytes
font_01_sfnt_off000115c0.bin
f52b2967e042e5261306e700246a70401631351bc79a98b92f6ec93fdcad886c
pdf-font-stream PDF embedded font (sfnt) at offset 0x115C0 11004 bytes
font_02_sfnt_off00012f33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F33 16792 bytes