Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33042019ed925ad…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 19:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7c5476338ad7d6b2c3baedb1848b8d72 SHA-1: baba8d5c1e59d0f73a06b09d5c60eb4228db1f6b SHA-256: a33042019ed925ad2bfea1128060a7f5dac4c69f364a67698e25e0f5b6695199
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, forming a link farm. The embedded URLs suggest a phishing or malware distribution attempt, likely using the PDF as a lure to direct users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=ds1052e+oscilloscope+manual PDF link annotation
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/52c1b5a718af5b4434d0cbaa4ba4fee2/56287238647.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/dibapiferuwanekosewuvam.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/kudinowifapapadobejidiz.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/91497471435.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/549736604.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/jiremilizikedami.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/17146d8fb160815951b685006cd0311a/34870598617.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/zufujexavitot.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/tiwubomudiw.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/70613522869.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/ledopimamowowuvamed.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096878db921c---tusexokawise.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/wotijabilabajat.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///20216235591344.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726aed467df---juxatevukelovozo.pdfIn PDF document text
    • https://mmszke.hu/files/file/97326059623.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92103032987.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/fagefavalumejuzevejiwu.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/2c3cafa39dd8f23f0a87ca8d8cadd5f9/6927250447.pdfIn PDF document text
    • http://renovator.cz/files/file/35255679970.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/41636604367.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF08 17676 bytes
SHA-256: c2fff9b86ea6e1e189d4762f9132a0861adaec4b08594a0ac2d3bece6d4f466c
font_01_sfnt_off0000ed85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 10868 bytes
SHA-256: 47c0e243654d1fb1fd0255d9da499171e5b3ad58f3bc4fd6af58faa234e10041