Malicious PDF — malware analysis report

Static analysis result for SHA-256 b013ac8e816b18c9…

MALICIOUS

PDF

81.1 KB Created: 2021-09-02 18:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: edbd78c15b29dde9ae4ce8070f571214 SHA-1: 8268d0206418e53e230e1dbb2fe5467186ab70f8 SHA-256: b013ac8e816b18c9844cf833453dee2a29f1a3a7af0b34cc94d296b6ddd4ab88
156 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 CMS uploads or disposable hosting, indicating a link farm designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://traiteurluc.com/userfiles/file/95904441053.pdf In PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf128444575---52902439850.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/jipogi.pdfIn PDF document text
    • https://flomogroup.com/upload/files/debebawuwibugu.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210727180307.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b5b3c86ca---nibopebagibuk.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/danopixitonag.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/redubevedukozit.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/14155937396.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/buriw.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612d8d7a5b914---99158336110.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-8-28/20210828214836630152.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/setunibovetuboluwi.pdfIn PDF document text
    • http://www.asslar.de/downloads/puwojot.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/82214150878.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/fujukimoni.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1d52d0dd5---ratego.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-16/20210816070922729363.pdfIn PDF document text
    • http://alcantara.cz/data/file/60923713000.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/63028260338.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/xepurav.pdfIn PDF document text
    • https://laps.pl/userfiles/file/gavapulamekedijefofini.pdfIn PDF document text
    • http://smiletoursvietnam.com/ckfinder/userfiles/files/ginokunuti.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/61437719125.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/21968715222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fungsi+stratifikasi+sosial+pdfPDF 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_off0000dadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 10708 bytes
SHA-256: cb0134ce72f0def87fcf512aa0dce6f0c878f1040421b90caa899d8a8246037e
font_02_sfnt_off00010b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 16572 bytes
SHA-256: 665386a5887f9d899dfb3ef2c941dca3134d4e7d55edc5d86c67b06c40194e5c