Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca3c05308de2556…

MALICIOUS

PDF

96.4 KB Created: 2021-07-06 05:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7476ab38ec9187c34e409d10bc17158d SHA-1: e3076c4aacb796120e186557869275ccc69b9c88 SHA-256: 1ca3c05308de25561513621c333a998308b07e39870628d42c175a797efb39e4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting an attempt to lure users to malicious content. The PDF structure and embedded links are consistent with phishing campaigns that rely on external resources for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://infrive.ru/uplcv?utm_term=seebeck+effect+and+peltier+effect PDF link annotation
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607055d99f9d7---21623982393.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5df4019dcbb6edd180a52ba98c3c32b9/fadezukusatejo.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/mokopevasuzaxokoneva.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/tb46nieep353obecdqujd05c2m/77037359113.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f151a7de0---ramomamabedudiduroze.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/13913ebb02fa029f5c1d7e172a855ca2/kitavovapemizosukefi.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/91471885736.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160986a598ae09---21012523870.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/jepujulibovebusonuxo.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b881778fd83---11514559763.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/jajimelokezulakowuputem.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/94028654393.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f3d717b9b---wibiwusugusolopugi.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c74d6a7e8---saxisikiwad.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/fililavopa.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/nelatijuzusakiwotit.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/9143016880704f5855092d1b5d484c8d/furub.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c610a35af4a---xisapuzi.pdfIn PDF document text
    • http://chinazzjx.com/d/files/33483221264.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40aef41b16---98570782179.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210622080331.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 19772 bytes
SHA-256: d83f1d8bdc32350697c04fde55c9eeb7e027eccf8db102f336b6a26c914c5238
font_01_sfnt_off00014415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14415 10632 bytes
SHA-256: 720cb72b385b4cf7e1259377b967f189379e66891600818a11d94e14ad48ff03
font_02_sfnt_off00015c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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