Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28854d1cf06ee36…

MALICIOUS

PDF

75.2 KB Created: 2021-06-07 11:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c78d9731154cd07912ba71fc4c43bec3 SHA-1: ae28ae149df99f6f83a3df799d11154bcc0f21b3 SHA-256: f28854d1cf06ee3650d3a9a352d08c399cbda6fec0e4ee35c049251ca6a2a107
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to 'Hairspray script pdf act 2' and the authoring application 'wkhtmltopdf', indicating it was likely generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=hairspray+script+pdf+act+2 PDF link annotation
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c84dec5b4230bd978ccdb2416454624e/vigabimilawafixuwawir.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94a80a1743---nodobifap.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609447a0acf9f---28111982730.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/6a2ee3a98220eea41ec7151e49ddf385/2715919959.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/tkha47ij1fa2plge94c1snjeaf/44323490731.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/3be548452c0d5fd323ce5b037aa25616/kidol.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794c4319ed9---lujoxudufexibunebajapeza.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba83d4c7e96---81266410100.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d737bce922---pimesumeturudupanabomo.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081b2c9cccc0---buretomumivutunuvuju.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/julupidixupakawavobakakab.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/6d2abd46927d4aa82444e3c8a81aaf38/vesopalopuw.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/1453fbd95efdcfb09ab33553c2578304/buwofolakizibemoduxef.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file/%5C/61052299168.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/70060582969.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/xadasamex.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file/%5C/2021060302583863.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 5312 bytes
SHA-256: df6345a010f03aa42205a7562472922e709b3ba7f91a0ee6095158316b5c3cca
font_01_sfnt_off0000faab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAB 10412 bytes
SHA-256: 08b4219e7ac8cf64f38c579da35f35ea6b437670fbbb7e18b1b4680bf01abc28