Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f1033f4348ac21…

MALICIOUS

PDF

85.9 KB Created: 2021-09-09 12:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6982aa3536897041a2af07f1ad7e08c7 SHA-1: 5145a0ae763584bab128c012910282e870cbd136 SHA-256: c1f1033f4348ac2118f3a3e31a7c391039f6b083c6f64e4e10623941152ab23d
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further support the classification as malicious, likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/otnsqp2qpujmf203iugr67tg91/97774002863.pdf In PDF document text
    • http://kukdae.com/files/fckeditor/file/gososet.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/26061137080.pdfPDF link annotation
    • https://fentesmakina.com/paket/upload/files/466939335.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/zodazonururu.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021921232493397.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/donesiro.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/85357392520.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/93596322707.pdfIn PDF document text
    • http://cortabellanews.com/userimages/roworox.pdfIn PDF document text
    • https://campermagazine.tv/public/file/8449980195.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/bufodez.pdfIn PDF document text
    • https://novitas.ro/files/42595931569.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/81939539138.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/23445484026.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i023h04usbsj8a5a3lc7lt9k11/82627676209.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/zepetabudilusi.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/57849763300.pdfIn PDF document text
    • http://serting.eu/userfiles/files/34742609823.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/fudopexusuv.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/13546829603.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/555984466.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/53304388876.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139278c38d32---kozazavisirotumenegubasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=where+is+the+task+manager+on+my+android+phonePDF 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_off0000e997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE997 17620 bytes
SHA-256: b7dd9798a5dc2da6c19f18c099b86b3f6042e019588b9ccedcc0a9aaa64962fa
font_01_sfnt_off000117b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B5 10992 bytes
SHA-256: f716c9b0e04a6aa2a1732d04fd01f2fff8f5563e51038b1522243e8e581e243a
font_02_sfnt_off000130f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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