Malicious PDF — malware analysis report

Static analysis result for SHA-256 0210b5dcdb8908f8…

MALICIOUS

PDF

93.5 KB Created: 2021-08-28 11:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c2962f8af3bdce4568d71084c8333bb0 SHA-1: 17f13f4fbe5a0cca56c0c7721565649384118c84 SHA-256: 0210b5dcdb8908f8488597db281ed9b84c61fac6c5934c7daa476437804f61ec
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, many of which are hosted on disposable domains or use vulnerable CMS plugins. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160df27d36fc09---34642585395.pdf In PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/34391975161.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/64796921701.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/e38e5f484e01503b1c633c014b6393b7/35862595345.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/75483953001.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1c60e09f7---88481128641.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/tibexolirabix.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/e55b95f3b9940ba1b95e77cd16bddcf3/visagodukixomenalidome.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/976b058ec5dfcf048eebc978e7692823/60871336817.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d358509f3ddca9451d446c0f2da161eb/soxopiguwoxekenetit.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/bbe9915a5bd6ca7cffeb04f21a1f7eaf/52685860089.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/wajevedatop.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/18009570386.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/mhi5lbn401kcdmu7tgk6dneuo3/nuramobazitutev.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/98507650282.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/25588861987.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/4b9c81b63a0f8353d6cfac2a9667bf9b/gidonebugiratalepiribisat.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/getamasibur.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3793400e49---12228982249.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/55547782080.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a729fe67---13292687025.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/xoruwudalata.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/devavifev.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/11499407063.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/65a1bo0q56l3o92qgpnpkpujra/42314074804.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/805e5c17749d04a50b895aa884bebb3b/63920750292.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210824041847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pickles+comic+strip+charactersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E4 17776 bytes
SHA-256: 9b85b5dc039b85471035dbe1e9861c4ae80966f90eb5cd7153f2a325696ae4a4
font_01_sfnt_off0001374d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F64 10628 bytes
SHA-256: bd542111b47c40faf5bae064f58c69a74830870f99bfab5e6076ad869d6635ee

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