Malicious PDF — malware analysis report

Static analysis result for SHA-256 c605bc381a37d43a…

MALICIOUS

PDF

71.7 KB Created: 2021-09-01 07:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bfaf2b2c226184847339d98d53e30af3 SHA-1: ef73f9ca4ff7795db5af5b177c15458d2ddaae61 SHA-256: c605bc381a37d43a3af7ebfcb65173327be8d6b1e5b165cdd8de5e7068cb7b30
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous heuristic firings related to external URLs. The PDF structure and embedded links suggest it is designed to lure users to malicious websites, likely for phishing or to download further malware. No scripts were extracted, but the presence of many external links points to a T1566.001 (Spearphishing Attachment) attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allytemp.ru/uplcv?utm_term=best+tamil+dubbed+love+movies+list PDF link annotation
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/06nbuv1bc9muqr0nujjhptsrc2/34440443249.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/kututagewaje.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/79164705611.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a19936be13a---jilokaweja.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/63175135260.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/bivakutiwirepi.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/cef0b6516510ba6b954544f630c55e3b/tevegazezezuxarejosarid.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9b23bc63a---79123810465.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/fe6b63db5956a9a04b7cb09d9242b118/nuvinesososujajosa.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8de4c0c6c4---34003861355.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/1u0kdd3isbv0gd5g8icuca5o6h/nujulunapem.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/op6i15tvajebghqocji4hd1r5e/17350448607.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/ovjv3i50su7v5062dui6rr8gf7/83734508565.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/jujitujenulinijemu.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef8be22391---35073072478.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/pelevekisedekirel.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4f0b48578---memapozuk.pdfIn PDF document text
    • http://endemic-capital.ru/uploads/files/wuzubesibiwegejaparur.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/c7998dd6bae27bc164b86113948eba63/62214723171.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/54303722448.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608363d300ed8---sorijagirorigomulakafuzew.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df8cb58a463---33587135753.pdfIn 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://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_off0000b623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB623 10564 bytes
SHA-256: f457c36b2291a852d89fe4ecff8dc3636519efedf6e12b4dfc7e186aa43f55c6
font_01_sfnt_off0000ce52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE664 17252 bytes
SHA-256: af08f59ac7af823a459b2976c00bc97c5efaa139ce41e4168000678aa44619e2

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