Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf3085526940211…

MALICIOUS

PDF

71.0 KB Created: 2021-09-03 09:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa3f042ac52ffa7bb77234b5e5437372 SHA-1: 42f271ae1562eb980a14359525d1fa8871372f8f SHA-256: 7bf3085526940211db69993ff0c54ebee0a7d5e5429b43486f043ac6c8ff257f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it is used as a link farm to distribute phishing content or further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2809852ea3---99648174390.pdf In PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/226092b9fe143617f15c76aa9409e90f/92808442227.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/53874a66456b72c14b5131b7204d781f/97908963878.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d4d5d1224---xefar.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a4f1d4bc88a---83762049558.pdfIn PDF document text
    • http://thevenetianmask.com/clients/71561/File/49845330211.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/67a3f7d64d33ead65b5e07854714ec4a/73674132752.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/suvepasafijadavonakid.pdfIn PDF document text
    • http://dejede.com/userfiles/file/boxodizevenutimu.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/24462552929.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/91142726803.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/rsj92rta7mq83r6m3gdmfs8joq/vivemerubogotufavimopu.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/kokasowo.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608308fa947d2---ximitenexowutezelaniza.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/nanivezuvo.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/62066611463.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/lazozamej.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/61132621796.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/fb7e760731a71a55c1ba9911688f6771/9760815000.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/furuputapolox.pdfIn PDF document text
    • http://hkwwta.org/userfiles/dorupunarawumevujatati.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/75569932276.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609184c2a1b9f---78252475201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=jurnal+reaksi+redoks+dan+sel+elektrokimia+pdfPDF 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_off0000b683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9A 10844 bytes
SHA-256: 8e90bebee66a68811d879d9fc15149c71a3839c54b8330715e4b0d9794b1eb48
font_02_sfnt_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 15384 bytes
SHA-256: a50522cca18a9a53cd4916138293ba5b027b3365be27030967ba36e111ae10e7

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