Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c0082a0990ad77…

MALICIOUS

PDF

74.6 KB Created: 2021-07-02 10:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 13feb65c4553261b6c2417290c64f8d4 SHA-1: 6fe17aac7b112b4bb6eb4abe644cf9f49c200761 SHA-256: 79c0082a0990ad779331bd43f61df5ceffb55028993be14757ab5909c297f079
156 Risk Score

Malware Insights

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

This 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 websites, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting and compromised CMS uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://expertcomptablecourreges.fr/michel_courreges/userfiles/file/90824696503.pdf In PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc71e1ea7c1---64637113505.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/81452695340.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/g7rdfstbg62b7kedvguq1r2lt5/37808011534.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c84ac11cb---42719721555.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/tuseva.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc7210653---tukosusowajitizefujasi.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/vabozesivupumetalor.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083974c6c08c---80319719124.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160db919e886e2---72233913620.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160735da389a03---zidetikamoseneji.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/4d2q317mpi05c3n2bek40bf8le/601208834.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/1122ddde61829e947cc34e3324608cec/88206952109.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/wigoladijimenogade.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b00a8ee6a---vapomineborago.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/25461787254.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/wifimuruxemoj.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d23e50ff7---lazoratimunisi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704d5e4edbb---mimizakokemofogajile.pdfIn PDF document text
    • http://zae.me/datafiles/file/92793387528.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a818cc88662---36579277837.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/tk9kfojj1rv54n5njs2re8gsje/roxiwadodokazaviv.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/12622054690.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf99b7a94---40776008155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=electrical+board+wiring+diagramPDF 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_off0000c2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BD 16232 bytes
SHA-256: 0840b4348a0de269a3b72133320064cae046b38212f3bb85412c421ecc950f3b
font_01_sfnt_off0000ecc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 10752 bytes
SHA-256: 4bdb8889b7149d1603aac8d0333533b2778a840f3d839eca6016f0fa50dcadb6