Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79a429ef30b63e0…

MALICIOUS

PDF

81.6 KB Created: 2021-08-09 08:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 30c61a75e6ef5aaeffe7acf2fdb677ce SHA-1: 7c1ca395260fb4befaa0e2a8f5e8d65148f9e87f SHA-256: b79a429ef30b63e0f0f7f9add82b455cd7b925c2dfd89841b5f3fc38195f1ccd
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to host and distribute further malicious content. The primary attack pattern involves luring users to these compromised sites to download potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8382cf54c---pewesedukatovapukaxep.pdf In PDF document text
    • http://abwgulfport.com/uploads/files/zuzusolavovaxedavotefufod.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/muwarifiz.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/cqahtj4q8lgpo3pefnithb5nc4/fifelu.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160e4658b5d5ba---18637008619.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/wuzumorimabavobirigeno.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f9876efff---sifuralarowovikosi.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/bexitodilalulidaropil.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160742fc325929---sofoduresobolamefaditag.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/88mvov28p68vef2fbumqn343l3/99821606096.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608f46ce371b5---furifeb.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/7l28un96ccec47oi7f7qb9kvn0/zoditowetomoworojilara.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/juzifife.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/p8l0s1g9ha7igghjpo2msegg8e/gunibitovowaj.pdfIn PDF document text
    • http://jar-ted.pl/file/23926000859.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f95016db11---magijosofawoxoxoresexako.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/36ffc49f556ff258a168f3afd7fe0aff/55707754949.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/tonelobo.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/dobulo.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/u3tseu82akpdve83svks95d5k9/katukalabixodawu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d89747faa---lanevugiluvile.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/26692775251.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3d5e5d207---72351944357.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a5a18177---wetolisuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sega+naomi+emulator+apk+downloadPDF 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_off0000d5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 18968 bytes
SHA-256: 7c08bb86e8f2230b81d19736437b0275cf2a16658004b96611944992cd953f0c
font_01_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E50 10920 bytes
SHA-256: 7e4ea1e5bb7c2c0a58b68251a61151acb355eed418100ecb4fc537f494552057