Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39a5a97e20d43c9…

MALICIOUS

PDF

121.7 KB Created: 2021-06-20 16:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8410704bf70a0d0eb705426fba58da5d SHA-1: ac7fdb5034c6cbf1e0adba35e7556ce94c40558e SHA-256: c39a5a97e20d43c9e975e2115be0c5165195a0994db814ea4d3987d43c3dc920
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. The heuristics indicate that the PDF contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad84f0df8df---wimefupodepotosurud.pdf In PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/f750925550dce279041a7c346f082c5d/66672211968.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/55503654315.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a10a2777b2c3b876e8836cf65223ae47/movexagesezuronoripe.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/solfc7o5b00vvgvl9k0bo10ui6/4806305937.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/rupadijanugeso.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3a852d744c890463b9a32e9e2f43c0ee/16224564422.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/26291204509.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046b595049---69047095435.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/fizesudulefopamewi.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f15666819b---wofuturewetixawixikupumo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1d0b2b181---92842095730.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/84182618489.pdfIn PDF document text
    • http://elm3rad.com/file/80555549704.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8f36cd55f1649ba6a1ba8e3b369e34ba/53160040567.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f955af3eab4d96f6bef248762e3c2bc9/66760982622.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=nms+atmosphere+harvesterPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000190d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190D5 4688 bytes
SHA-256: 6764782d2a7ea457ff4c3e796608cf1a541d3cc8ddfd0b3c8f2a29017e922119
font_01_sfnt_off0001a0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0C6 13640 bytes
SHA-256: e81414148adc692ccee8afa65e800676129b55ab3e68bb83c9078afbb273a39b
font_02_sfnt_off0001cb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB39 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361