Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1cff8eef6e0b39…

MALICIOUS

PDF

86.1 KB Created: 2021-07-19 09:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 683fb372240e5e55e8911ab657a46f37 SHA-1: 5dca67d732de4e9e82eb3bdb2e61644db6b174a1 SHA-256: 6f1cff8eef6e0b39843634ff5d3a629b4c1fff98233f93276a88d812cff76315
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting. The document body is unreadable, but the presence of many external links suggests a phishing or SEO manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://mimpiindah1.com/contents//files/wozuga.pdf In PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/35081b10cf00b33e1f3fd08af9a53cd9/51609028945.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/filufuvova.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/63f298c14a0c853ef8dcd8a174904e46/jabupevazo.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160875f90df75b---40538234219.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdb496a48c---fiduxaxame.pdfIn PDF document text
    • http://unsersohn.ch/images/file/wezadijiwegagawakafuk.pdfIn PDF document text
    • http://fastgood4cheap.com/clients/4890/File/gapudovulozuxonug.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/31856180.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a3fcb36907a7add88b0edc36452fd00a/soguti.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/xetapufumabupobilezudevun.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913dcd4d469---kolejowafida.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095e28f73535---97499121343.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/49838848499.pdfIn PDF document text
    • https://triosms.com/userfiles/file/wenexotovolutanemopir.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/21199897112.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/goxiwiruxibo.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f91a15722---tisajiwuwudonosowakot.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c23e720aef1---deborakugelitinegilube.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/478bdc1a05fd0e45eae386bff5692115/83796670355.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1ce7cc38c---pubuxivuxemafipefu.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/90947835911.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210630165035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=psychrometric+chart+at+different+pressuresPDF link annotation
    • 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_off0000ea47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 11052 bytes
SHA-256: 656e9f8c48795bf0857732e6a216fac66c55cebbc0d561f05a51de555e5c92ea
font_01_sfnt_off000103e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFB 17776 bytes
SHA-256: 9747d606c29ed94f3e9ad9dc30e6e58afe0f5c8802ccb076b04a1cf8cc478556

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