Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05e0e21b77c33de…

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 01:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc536a7eacbb63f73cbc5917d498e834 SHA-1: dcb8f77b143427fa778b51204a2c38158ef33ad9 SHA-256: c05e0e21b77c33dee680bdb5ae33a86d94fadc18a25f7927958ec23fd5e26bd8
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 are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and appears to be metadata from wkhtmltopdf, providing no direct user-facing content but reinforcing the file's nature as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://allytemp.ru/uplcv?utm_term=pokemon+games+for+phones PDF link annotation
    • http://partnercable.com/files/79536775703.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/libekuvijida.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/1997155741.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210907091418.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/xamaruju.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/lufarolelawavowufebi.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/83460031984.pdfIn PDF document text
    • http://esangsok.com/upfile/files/67984155266.pdfIn PDF document text
    • http://lamay.de/userfiles/file/94091227694.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/liririsezoza.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/57847772259.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/25526456810.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/fewigisidu.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/ninalenedo.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2c2239ebf---firiwukowogiku.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/jawavinopuba.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/10154691145.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c660aa8b7f---32702483708.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/ruzowali.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/gekujodawizasote.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109081431212346.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/65479564704.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/situjijuwilu.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/59441128625.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161361190e35b5---30891976240.pdfIn PDF document text
    • http://darec.sk/files/files/40196989970.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_off0000d95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 10660 bytes
SHA-256: 635b64efd9ae2ac6dff34a8c7978b47090056459f63128e095393220304e3db7
font_02_sfnt_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 17544 bytes
SHA-256: 3ae34d032a6e45a26bdd683299fa81e000113ec6406585c6725bb36b73942545

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