Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fffe38e4d6f8be4…

MALICIOUS

PDF

84.6 KB Created: 2021-09-04 14:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 47a2a794444570079f885d9ab31ac67c SHA-1: 104ca178dfdcec6fbc2269254185eb78b360502e SHA-256: 7fffe38e4d6f8be47715c8f92833a83ea6e4fd2bf9667f50fa443ad4747c0f89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The document body is heavily obfuscated, but the presence of PDF-specific heuristics related to URI and link farms indicates an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4f9519b3a174812b449a5d55a41fb83e/jetedaras.pdf In PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/013dd717aef0f7dec6a110cf13ddc066/41271930269.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/bc2gbcrpci4c75p5cdccg04p1n/sozonowurela.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/jawimasade.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/sutokuweviz.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vhm1qpamoc5hkljc9tkfrfhaq5/83184356001.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/429debeca04203ece3dd2251ba5060a3/livukatuliwowobulirov.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e12cceef85---vorinerujo.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16251485831057.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/senimagijupelazakawisoxe.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/bef809b1eb398e4415b8f6c8baacd68d/ropidemigeratedowoz.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/74995301205.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/28842381362.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/m8p0vnl3jgfvflo968hldnceqt/dikudekuxusijevum.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/samilikovaxowagurevar.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/72175101878.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9qvhi2gh7lb3mp44klf92suqf7/rivexoxubiparep.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fed6c62c95---jadugijijatufonuxabu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073b8a279b24---20269732685.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/goweburamogejo.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/sulonerofulemilen.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/mevebilekeg.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5fb69a5117507abc27ef29a968186ea1/10559768000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=exemplaire+de+demande+d%27attestation+de+travail+pdfPDF 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_off0000e205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE205 19596 bytes
SHA-256: 77a46c77e7689093414633a2edf2ee963d4f62c1eaaa7bfbc2154139da532ffd
font_01_sfnt_off0001134c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B63 10844 bytes
SHA-256: 82a43e3b5fe45753aab875f02e13656fce2606694f6d8f9bac72f05aab8059d3

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