Malicious PDF — malware analysis report

Static analysis result for SHA-256 043df294de1ca4cc…

MALICIOUS

PDF

91.2 KB Created: 2021-07-23 07:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c31a617f54810d41600c407b7e4a3f49 SHA-1: 9f85964b8dae1aacecd53fe67915f54db05f0281 SHA-256: 043df294de1ca4cc8e2394256e6584c373d9a875620255b664eacfa89bf03aa6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other potentially malicious content. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d06e44d8b6c---6254021420.pdf In PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9c5c8efa6---rakafigabosowibonelakemov.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/26481876639.pdfIn PDF document text
    • https://armenia4d.com/contents//files/24766421366.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/3f2886e17c6b33ba025c76b756be4846/19110717678.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/a66e0d419e9d879456f930397fd6ccdf/gurapigexu.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/65896505433.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f631ec8c1---sunasagovubogomomimusuwe.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a3d7471870b---97848091093.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7468a170a1cccf1f9267d9a1027268b7/gatoporelakuf.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/93686016491.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/talijumejuketinezitim.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc709704f0---matonil.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/musorelupim.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/9fad3e1792794f4b5818c2a7609a3239/65223108362.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b63a35740e3---zinamibigipogejisikob.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/6kbt3k7ac95mitnk2mptbv0i02/mujomisisuduniwago.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/94884761601.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f533934ca4---sufapiwifelolaboxa.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/05e2d1242cf47390e7a40eca444fd8c2/segajafareguranonogomob.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbcceceee1---sezowibo.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/9138521a492f98a000cc3a2e337e5216/21894482393.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/tavexa.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/7977853588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ned+from+ned%27s+declassified+nowPDF link annotation
    • 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_off000100c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C2 10636 bytes
SHA-256: 304da5581db927c2a186718290cb2a135d7e0ff2f9938db9e66503b6385fa108
font_01_sfnt_off00011927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13139 17408 bytes
SHA-256: 1fff45ebbd86ceb985272f859e11ef800c305d23512113ba74305ebbbbe9ba20

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