Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7440a035f24fe75…

MALICIOUS

PDF

75.3 KB Created: 2021-08-09 08:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 20f71714ff3aa62b212bc31e251c8bfc SHA-1: cb58ca7e5d74f243f3e76868088b045eb5a80966 SHA-256: c7440a035f24fe7568322e02c4e9ce6899dfcaaf2b5eb81d0f71374c419cd058
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to potentially compromised websites or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO abuse. While no scripts were directly extracted, the structure suggests it's designed to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://iccarrentals.com/files/file/66279376719.pdf In PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/86150762602.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/napiwomafomodajunigo.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/fojusumumezivinuz.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/5218927875.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/pupoxisili.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/22794222877.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/7lgjamjg9kgikkoee2p6n80a26/bajebigotare.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210802220126.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/rawujajez.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/37f694a13e41fcf8140ca7820921c642/49310847869.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puferab.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160886a184f139---zususonizikitopipararus.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083b02be2941---lupefeneza.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/6178c281a58d260ae7c6c1352b93c501/26166683136.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/d31a5ccee286d83c10d020147d340d16/dobudukololakowipo.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/39138121817.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/vifufobowovaw.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3916efa35---11338468075.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/busanitikadamulemusajego.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/sapulapu.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/25288351605.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/81998338398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=harman+kardon+hk395+manualPDF 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_off0000c551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC551 10680 bytes
SHA-256: 46b5b86a77ff23dcfc2bffd7dfc9b1af01354169ec38d4f35495f2552a280c23
font_01_sfnt_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 16136 bytes
SHA-256: 4edcba3216b07361346b35d19135ff80ae3157766b41918aeb8254110407449c
font_02_sfnt_off000106f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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