Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65fd7eb9df3d14e…

MALICIOUS

PDF

91.8 KB Created: 2021-08-11 22:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1545d96ba393d5359b3675bd0646b943 SHA-1: c2833009459ee87a5e286b80a172cdb00c57e5b6 SHA-256: b65fd7eb9df3d14e8891bea23b5635b5a49bd3d45b9a2a665656489197090865
96 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites. The ML classifier strongly indicated maliciousness, and the presence of multiple links on disposable or compromised hosting suggests an attempt to manipulate search engine results or distribute further payloads. No scripts were extracted, and the document body was unreadable, limiting the analysis of direct user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 http://tcihk.com/userfiles/42708325817.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d99292ab1889e3c84cf6e70c490a488e/3934857717.pdfIn PDF document text
    • https://o-dance.com/upload/files/sigekadaxufepifa.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/66995454601.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/wagifejubemikelixisi.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/gelek.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ire4ja9p2k7hhptsibbbeo919f/gamanokimeralitopaxasuje.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf2edcf276---97117923211.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/f3ee00ce4d0f988d870b28f27e309c5c/4042247526.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b19663eb3a4---5423032098.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/f367ff8564cbd4221ac08598d2143f2e/24502011741.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/b9bb6tqrakqmqlikeqt4vt3hr2/juvevot.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608201cfe0751---75389025550.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/hk3s8u5gls8fgvpvl31cvg3r16/30029490407.pdfIn PDF document text
    • http://hodori247.com/uploads/files/78445969061.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/pupomapojatelapatovimiz.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160be824fe48e6---38756109205.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7f76a8e3f---xijumil.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a556e75bda4---77230474992.pdfIn PDF document text
    • https://migger.dk/userimages/file/wexesawufiwajomafina.pdfIn PDF document text
    • https://mashura.co/userfiles/files/wamexudabase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=adjective+phrase+definition+with+examplesPDF 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off00010116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 11252 bytes
SHA-256: d92bbb0fc0e6964c469bff9c0bc273fc6add574ae17287864a4e9baa2a87f9c3
font_02_sfnt_off00011b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13366 16672 bytes
SHA-256: a2cf31daa8bdca98a8168e387df2d7f27ca2a4988a52f8969cea93c17c5976b5

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