Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e30e7201614a0c9…

MALICIOUS

PDF

74.4 KB Created: 2021-06-25 15:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 61068afc54e6b8dd1c3694454a2f5d92 SHA-1: 10793fa6f05a88e1a393d91624d9c6c25c742bdc SHA-256: 6e30e7201614a0c98447c20cd5237d0d46573cd03b6646cf7c6fe5a7cf63c054
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress upload directories. These links likely lead to further malicious content or phishing pages, aiming to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb7013dfb5---nojewuxarolu.pdf In PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/5a52e234f13f138c3fb0baf4c6856600/gesikunukuj.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1068cec239---12169791602.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fdc0cdf32---lenagulepigimijof.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/abu5h1t9o8sh64mc7d2ika0g88/purijefogozus.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/40992079281891a69f7f9945d0982af2/koxusevifewasiz.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/92758725600.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/db36e145b6dd63cbd4961f2720bb4190/nubemireromibimudedu.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/9lkhmbie1hsn394d8k2lm0v3r9/rajagimedopafimizus.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/35508460282.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c19a021fc23---vonivomojitunivaba.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/famatejuwofo.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/0q9u0i5ahopfe7cnf7h33fk7e6/jigexijedobiwasedavomose.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20216231417339718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=svg+to+vectorPDF 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_off0000c284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC284 17056 bytes
SHA-256: 01827bc6170187b50d08fc21675976aaedb90844d8fa311a73366e3b6b048a82
font_01_sfnt_off0000ef2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 9976 bytes
SHA-256: 40eb41b36eef450db2044dd9aff0332ae80808edbda143ddc8b3b5cf120efc60