Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca8e833a912437f…

MALICIOUS

PDF

74.2 KB Created: 2021-07-04 01:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9b546bfd152941d08aae96ef4f0df633 SHA-1: c24c4b6f95f3efb4c0a46de6f0736aaf3715b884 SHA-256: dca8e833a912437fafb229a8860dc4df3ff5d3ee852864ff74b50d1ab360a456
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=i+would+have+been+there+meaning PDF link annotation
    • https://strechybenesov.cz/content/womakaxokubaf.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/vazarodugova.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/3949f15da0ae1fbca7a00c852c25b9b5/xaweruf.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609344266467f---75765565100.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/827ea5a8fb5f5b632871cfffb3a21314/90443826854.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/50129450701.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96fa57282---15306487579.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48335c6658---pikonapokixexila.pdfIn PDF document text
    • https://paperland.bg/uploads/file/bowikofisefosixifiru.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/02d1a1b0bc4b28e5d389b476dfb759ef/59118626159.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b083a9a3639---fikorip.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/lixezelakeguwirupeluge.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/usi6jo1j6iaec5j1fuocgenfq2/ligutotaronozabo.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/kamizaxopapotuv.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/lazusumafege.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2bec75576---7434040609.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/82655241955.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f82e934f47---81929034116.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bd18016f7eb---kuwis.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/51270184231.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/4505532572.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/tatesurafoxunip.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b2874441c---xujoxususumevivuwudatub.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_off0000c0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E5 10868 bytes
SHA-256: a486898ad7ecf14c4a1ee8eb3a3970105a46131e401661d32ab3fa6cb2c4aab9
font_02_sfnt_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 16464 bytes
SHA-256: 135b43753403849df09a556d7ee2524a46e683a64c5a6de4b35f727911cb2cf2

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