Malicious PDF — malware analysis report

Static analysis result for SHA-256 7912b4a7fcedbfe5…

MALICIOUS

PDF

94.2 KB Created: 2021-07-06 12:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2335e17bfd805fd1be3f237514fd08ee SHA-1: 36edb596142090abafcd7b7f75a0b3ebca9322d6 SHA-256: 7912b4a7fcedbfe5106a6a0c2b42c335a7fd87d5dd42baf4bd9abe85ea197217
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external resources, many of which are hosted on compromised WordPress sites. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to mimic an invoice or payment request, likely to trick the user into clicking the malicious links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7c92e77ef68ef2ca585e5e6b3a9b8727/94614559460.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091d7af0bc6b---46339300757.pdf
    • https://barrierball.cl/ckfinder/userfiles/files/jarujupiwotewunar.pdf
    • https://gemwares.com/userfiles/file/vodeti.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080135ee1502---54952667436.pdf
    • http://gursakaryahukuk.com/images/file/vodugivek.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8574c291e6a7b7e244fe9d8b3216337a/72150291302.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a0b279754035c9789fee6265c915c9d1/98445953626.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16070c21180298---wojigoderafapirilikevido.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8d0945a22---81237305444.pdf
    • http://asckhn.com/acskhn/userfiles/file/xulewozitejesebikugomu.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/2845bce1af1ba6b0f711a04c7c694cd5/tikixesebipovul.pdf
    • https://le27.fr/docs/file/gekurob.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/79fd275a88eca2f6350c838728eb18f0/sirajegotofukekugodikij.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a001795a62a---27334761122.pdf
    • http://coimbrasoftware.hu/images/uploads/files/xijawanaximibaru.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/d3677aaa171951624f403e59137f2ae3/34033867998.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/78c7f7de9579f7b8e297dde7dbd643e5/rijonegugajodiza.pdf
    • https://itexpertdog.com/upload/files/nirukiredojuvodat.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/7ba41ef89c88e40fc6e2562488d52e73/tixomojakud.pdf
    • http://clubselectionvoyages.com/images/file/72774119212.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab9b576d0d---78014892558.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc155b1fdf3---21565977528.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/ls3kff65r06u6mv5g4si59lb4o/45913945626.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/75607521976.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=thanks+i+owe+you+one
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f16a.bin
d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 16488 bytes
font_01_sfnt_off00010856.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10856 16792 bytes
font_02_sfnt_off00012068.bin
85f1610311f27ec80eae3bb9f8d35088db1d5fe1742cd984afb88568ff1e1a84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 18972 bytes
font_03_sfnt_off0001525e.bin
9bd565b22f341c625142e4fa1aed630f5015d7f34203a4a6f4d28e2ae3891748		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1525E 10316 bytes

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