Malicious PDF — malware analysis report

Static analysis result for SHA-256 e00c23a7c2608538…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 20:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8dcae69eafd09ffd000e57608e22ac3f SHA-1: 95823c91d3850e27862872268283d78da7ccd3d4 SHA-256: e00c23a7c260853839a756d403b083cdc651caac6c77978b7ba062887c11ab7c
156 Risk Score

Malware Insights

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

The PDF file 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 potentially disposable hosting. The embedded URLs are likely intended to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608067c800d3d---murawu.pdf In PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/70729332747.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/969cebf113a5b1fbdd70bede107d586c/57599006348.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fc176c19176---nedizimidex.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/gagufotimelegikep.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105c6e5e9fed---jefuwefoduxesulugufigexi.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/384cscod5uhqdf7tmmapsd5e1b/36697670697.pdfIn PDF document text
    • http://fnathservices.com/upload/file/47100146672.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/feselapewazawuxekomib.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/bopiwofebitisinuvoxasikal.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/veritowevevajawikefigamew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f27498318---polifija.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/79900437437.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ru8qmca48nth52fjsmti72fgt1/kemipuda.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/zagowivurar.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/kogoxagavugukabuba.pdfIn PDF document text
    • https://scriptdd.com/_file/file/35438454313.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/7bij0fi4k8111194hbuh3pnqr7/37639202297.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/ruzob.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cde5c5647e---xaniravetabafazofulojot.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082710b21924---65743350328.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ecf4a4e190f---musigu.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/jjkk41nlv6nnpofil25e2qslhc/48984392136.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/rerepebulitilagobuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=blood+pressure+medication+with+diureticPDF 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_off0000def7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 11016 bytes
SHA-256: 89d4ba61617ad5ccb814ed456a5e4f405e1f6c6581fbac8ce74e7ed52580ee03
font_01_sfnt_off0000f879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001108b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 17132 bytes
SHA-256: 55378538b9646036e2ee40cfe9576614f96973d428f688cf17e02c9e0e75a773

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