Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7a727504d956a3…

MALICIOUS

PDF

85.6 KB Created: 2021-04-28 19:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0307fd04014de6e5a7792893da26693c SHA-1: c59fe9cb53c824ad373c745c3ef5e9b8ad1aca60 SHA-256: 5a7a727504d956a37044e2c56ab5d7b2fdf0f60605ba1e582b1baa8669650e2e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to potentially malicious or deceptive content, aligning with phishing or SEO poisoning tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/b4726921810927950f188e097c748896/xeliwixepokirumo.pdf In PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160815bec88c13---bonexibamuzebe.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805398defdc---41972780878.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/isfpho7812clkkp20jmn7ebje5/52017792006.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee069c64c---96492717158.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607154469698a---gogosexozixuxirelebozobob.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7b36cc424d4e625916d1f9fa079671eb/morafeporilazowoxijof.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869ad7047a0---wolibilanemuxovul.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/7b52718399d2e14659eff52cbebc41c2/kizitozutiluvipumes.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/33539c8b46d80fdf781e41887f970a4d/54299413906.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160880278de2b8---xetag.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa1a9cb29---rumuzipef.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/bqsklovvprsp3shjudef7qae45/zegosotogelufupog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=undertale+violin+sheet+music+megalovaniaPDF 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://scripts.sil.org/OFLIn 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_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 5404 bytes
SHA-256: dc5fcd93823326ddc3325ddbe2bbb84def2f12ba3628db284876d78f4469d064
font_01_sfnt_off00010233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 15700 bytes
SHA-256: 8877b35e88aa174d5d41ced2e602ce30f52046c1886d141604e1892f87a8f416
font_02_sfnt_off00013522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13522 16132 bytes
SHA-256: 38fcf4ea3c4064495b9c09a7ef6946f56b1194f5b917bad2175a3786c2c34ca5