Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f42b828ba4b3876…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 15:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0f11e35e68685e7423c80d34bc1844fb SHA-1: 6363c08b83d4ac8357b1b9445fce3ff019d9333a SHA-256: 8f42b828ba4b38765469e40cf08cbb43cd0f7171384f483456f44ad6052755fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristic analysis revealed that the document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160779576b69af---63661566989.pdf In PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e490537487---50306720813.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210822061308.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/91054166090.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f49d171e0d---79359137017.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/26483800311.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/65446809716.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/30475267301.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd2c953694---26537283933.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/80268404939.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123ab931a411---7972552451.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/kejanizuraxej.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/41095231325.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/gawelaxedipururino.pdfIn PDF document text
    • https://jagominum.com/contents//files/nametirobuvobikunamexa.pdfIn PDF document text
    • http://ledson.ru/upload_picture/45914075247.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/betojenurudenisunuwe.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/c2fe68dc96b930e83491023318c42c27/66830691870.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160abff07e15b6---27208720177.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0f5f9c01d654a9a2d761272d69c9a480/95943071064.pdfIn PDF document text
    • https://olterus.net/contents/files/73722922370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=repaso+a+spanish+grammar+review+worktext+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/cd094e35c5cb265dd0b975f80734551b/kaxabelud.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D5 19432 bytes
SHA-256: f2e2b4daf5432c11ccfd32c3be84e561fd9ab786931ef14e2d0eee4a4fae3645
font_01_sfnt_off0000fb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11317 11288 bytes
SHA-256: 4c68c45b5dfbdf8a752452e06d8f400205b49d9646f2b48b9354ef956039a298

Open this report in the interactive analyzer, or submit your own file for analysis.