Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca71ac7ea4c2a52…

MALICIOUS

PDF

94.2 KB Created: 2021-07-06 13:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: df41a883a9b9b70710bea1cfc3b7494d SHA-1: e43a5be7ca6834527bf898417a02c68e280273cd SHA-256: fca71ac7ea4c2a527df41c7ff8a5b0f7619b86c8fafdedfd9b436aee4e02284a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload locations and potentially disposable hosting sites. The presence of external URIs and the nature of the heuristics suggest the document is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=difference+between+lcd+led+and+plasma PDF link annotation
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/eff40ae52129fa90009fafb28ae9b46f/sirazirojidomaganilus.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/8130601653.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/9ce8f5e1ab479c9d72f102854648c7cc/78268638013.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b37f232b45---84016472496.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4680b1acdf84fe71db0ceb85f54ceef6/15811697124.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609119544990c---fedizawuruminosexagagafo.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0688061676---kejerojujigaraput.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/53587078382.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/petumekajamokotedojas.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/xululuwapuwipakodezup.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/vejosemelifozawisenura.pdfIn PDF document text
    • http://congluc.com/upload/files/gufamuluxibuzabumaduxejat.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c65feba7445---99943472400.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/651befc1e76ab6f08e5b2f916d13fcf9/sivagib.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0c9889450572da44367b40e4c9c97aa2/72065626964.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/21415056442.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f48ded31b---gifonudenopi.pdfIn PDF document text
    • https://baongochoa.com/upload/file/xatuzutilenipo.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/67165e361a69ec89bf9eb95d6517c515/vezef.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/vufiw.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160700146112c2---16840320740.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3290529af---6776494865.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_off00010ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E5 10888 bytes
SHA-256: 97d7fb5947b0802fff87c1cbf88f077240a1f72d6d883bdc3c19a105a6cd4317
font_02_sfnt_off00013be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE8 18544 bytes
SHA-256: 2afc37ff22b5d09685d094db1825421df37c00c70e49e1c4cd6c00404b083fe0

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