Malicious PDF — malware analysis report

Static analysis result for SHA-256 439a4c8c9067f02a…

MALICIOUS

PDF

95.8 KB Created: 2021-09-01 15:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 05e506f2c086ac5e2d6356703e83f3ce SHA-1: 5ae65197bfea798cb65a3b6c7ab3b04e8c582d03 SHA-256: 439a4c8c9067f02a6d7abc292f9d0d3545db5ccf37763326e1978206cb42ccbd
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0bb448daf---69024091626.pdf In PDF document text
    • http://campbellelectronics.com/uploads/45375088251.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113965ead89a---34308829286.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/13868135717.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/40ac53a96c04185e423c4b3bfc127d61/15474739400.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/21851397801.pdfIn PDF document text
    • https://atiksigorta.com/files/93609045194.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/bf695444e0ca9db53b6dc75a0ecacfe9/70456147817.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c972d95635---46108756243.pdfIn PDF document text
    • http://derma-dts.de/files/file/binezezarelepovek.pdfIn PDF document text
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/fanokataruxegizoxo.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/3a9d13b9bb5b154f280a14cdedd72f24/bigeg.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/c84530363a99645c8b18aa00f126a9df/wakoxofegikukuf.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/77277876265.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/21463733762.pdfIn PDF document text
    • http://trevorhannant.com/tivajuzupoxitonazetirajet.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/wososuj.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/6c6d269a1f675ace7b7ffc6dbbaf2a3f/kisurelix.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/mavavanu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606de6930818f---gevuzemoxeraxirebakusaxob.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d299dceea---wipawiwozo.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/nufafodaxutifedi.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cd7e68b13---11965427817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=oil+drilling+companiesPDF 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_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 10784 bytes
SHA-256: 63b1476a864b2823f88ad5e1d422fdeb18e4bf83735d8baf38b63f63444633f3
font_01_sfnt_off000125db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DB 19312 bytes
SHA-256: 2d3912f4b94282d0969dcb0f13bdeedde5df18d27da928d2ff67f594b2369f4c
font_02_sfnt_off00015873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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