Malicious PDF — malware analysis report

Static analysis result for SHA-256 047bfcae43a9efac…

MALICIOUS

PDF

72.3 KB Created: 2021-09-15 18:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d428eeb882121f184c65977e692a01a SHA-1: 5af7b10aaf8325a94a0af35c10f2a6cd4643d531 SHA-256: 047bfcae43a9efac627cbea19f9f067c064fce5ecbf586d4eedda6e3d80eee56
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as disposable hosting or compromised CMS uploads, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution, by redirecting users through these intermediate links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://starinviter.com/ckimagefiles/danesowulas.pdf In PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/gebevawivamoj.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/41940525528.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/33950894944.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/wufitawapobez.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/59592129328.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/potidunujine.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/gezokuzexaluvuletijid.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/68503116016.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/banetukulom.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/44617409499.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/76628540871.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/1b548db18a7f5500a4b6ef9cfbdbdcc5/12358945170.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb6d89b222---dorosexulogurujer.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/jobazebufagudera.pdfIn PDF document text
    • http://eternoohydro.com/d/files/zinidagogosava.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/zoloxiriweteroxuvigexazet.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/32031807751.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/27952620268.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614137e5f3635---kevoneg.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/milunuzeturozixigubaf.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/55717007388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+tell+when+your+phone+is+hackedPDF 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_off0000bbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CA 15304 bytes
SHA-256: 3207b12021f5f71605e2ca853094a2f17749e252f323e747ad692b2ea7421b9f
font_02_sfnt_off0000fa60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA60 10996 bytes
SHA-256: a9e37f61015eaee2c9c39e65956c01f5cf468e390c153a97ef43bfd8bbe5aebb