Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94d0a398717f701…

MALICIOUS

PDF

87.1 KB Created: 2021-07-23 08:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 14c6eb1d1c604fcd73ea9e47155e1916 SHA-1: 55a196724cf003746a79bd90d786d0b92660e5e7 SHA-256: b94d0a398717f701a1d1c1fec36e8740d2dd0f7338fbae911cee5501ccbf7abe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links align with common techniques for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://dacinsara.ro/fckfiles/file/88035181810.pdf In PDF document text
    • http://wsp.pl/userfiles/file/laxatixexuzodelonoguluz.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/3658b6e5961f24446117eed9e04cec45/33664377450.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/5662944947.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e88f6f65fd3---33615631163.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160704a9186dea---loxunafupidijowezug.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f8ab39e60a41f73909167877e7339c46/rilurenedisazaxoneg.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609967d8d23f8---32533028816.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/5350100f3a52ffab4aede5b6cd95e28d/rezojewafedipufabepi.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/xusurazosesavimabokilej.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/5042022799.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/juwosasakezosezoja.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/52731682977.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c083a9b6fc7f84487bd6c98dfd58b21a/nujufukajeduzofituwifotu.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/d22f35d520f622d57710c5f1fc2b1091/70121208256.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/2872080645.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/lusamozapavanolafoxa.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/bunigagutewiv.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160acc16c09475---gokanodosuwalebafuvujit.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/11198432375.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608850e750302---13210268214.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/3nshvbdk1njbaok3knvig5bn8d/23339551433.pdfIn PDF document text
    • http://hrudolf.com/userfiles/26196748756.pdfIn PDF document text
    • http://inistor.com/ufiles/files/mexaximimeved.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=labour+productivity+chart+in+constructionPDF 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_off0000f0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 10812 bytes
SHA-256: 514a6307e11fab577c68e299036b23aace7055fb7397172c8a92c2f4056c1800
font_01_sfnt_off00010958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10958 16916 bytes
SHA-256: c06db5f48f142431c56b79b534162c598335e6ef6fcca63d6b868f896e7aec5c
font_02_sfnt_off00013563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1