Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3d41e8731f8e18…

MALICIOUS

PDF

89.3 KB Created: 2021-06-26 13:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ac114fea1e5a967550e56307e9c06f28 SHA-1: d41814480d908463f12b7d447affbd6dfc4c8fd8 SHA-256: 6f3d41e8731f8e18909899d061ee16e5e1f53b04978f6e69f183507c0fd4ce9a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cructi.ru/uplcv?utm_term=pmc+module+7+assignment PDF link annotation
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca79eb187f---kurowe.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/380b97b4cb3a73319efb508f48eb0172/94896872801.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a09fe97e2e1---riselexiwerujizigixumod.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1e0dae03aff7309d1773ddbdc7c9f42b/buvagagesidovazilaj.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf11115f54---vuvakujiridolowazedud.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c658e1bfe0d---mulolesoxupobir.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ade7e98b0---xuwuwiwigebivosim.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/24122963385.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1fd394ca05871bd09c191cb4b4f3ac30/xotumawaminok.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/176tl3haupsj4qpnidpm1iiq5v/59335705738.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c912426eb3---gumumatujijokibi.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/27c0cdda440be8e32c7e91469e78f1b9/jojijinofujeg.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b64d49a2a19---83991118945.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088c0351855a---gofukesi.pdfIn PDF document text
    • https://binhvi.com/upload/files/32792576431.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f18501dd29---49285242042.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/70529165630.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9274cf2edc---jejuguxidelal.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/lizulopizavigaxilag.pdfIn PDF document text
    • http://belst.by/upload/file/vajawasenufutoga.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607823993c266---sinojodepirujod.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd719a9c53---14581888055.pdfPDF link annotation
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/8e692d129e4484c3ff93fa29f2a5ec33/35785400124.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/fcfa81c873cf04d81b61628dee2671dd/wikifaziveramewoxerefo.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_off0000f970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 10764 bytes
SHA-256: dfffe129891f2e83cd5a6b32c4915f395d4bb96f999907e23b072ca6364751b4
font_01_sfnt_off0001120e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120E 17972 bytes
SHA-256: 992f4b163733082ed480b0a91927397de8ea7493ae83b49bf7ee6a284d602fa1
font_02_sfnt_off00014010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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