Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba43b3774f81c5e…

MALICIOUS

PDF

65.7 KB Created: 2021-05-16 07:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc08d87030c85a91f32dfdd78136ea42 SHA-1: 6420aa663ade0fc421dd8e5737cbbf48de4eee8a SHA-256: fba43b3774f81c5e53d65c036cf67706b16b650a58037c7c581ab1ff5fe47336
154 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains references to 'dfplayer mini datasheet pdf' and 'wkhtmltopdf', suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9488

Heuristics 5

  • 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
  • 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://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ffa8c67c---momaroj.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/eo65buoc9qu36u816i61uaajrr/nijilibup.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608960e1aa80b---80693896242.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d31808a36f10bdcde2d4a1e52f1aaeb5/94308362702.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086edf6ae06d---85447821056.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/pt2s6lqp461m002m6n3b8as272/xapuzuxofevogobidapeziwi.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160876f8a2ad8f---17590109645.pdf
    • http://buergerforum-tirol.at/file/padagutavigodavukubese.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16083272ee0ce3---5404438280.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a201894e42---latuvebegizolulimuwef.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd1a846655---pusuv.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608382a80dff8---xoxusurepakumev.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/ant9569a26q0mtl5jlinn1v5c6/werereguxipogujifojogopo.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/69e39e02bf31e90596f7e999b24a8066/nurobebujaza.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/dae113085714afbaee7dcdb4e0e4a2c8/45639884095.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/31998185809.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f742f9059e---zupakij.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vf5nkvnbff86074e6m1d5ivhi6/53950776826.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=dfplayer+mini+datasheet+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d359.bin
ab96b0b6bffa04eb12c001d9d40b04197d9cccf831aaa0ba615a28f4c7085302		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD359 5384 bytes
font_01_sfnt_off0000e588.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 1800 bytes

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