Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0bc8a49d8159dd0…

MALICIOUS

PDF

100.4 KB Created: 2021-07-19 10:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8724d128d7c4651b7f18e8ad944321f4 SHA-1: f94c2e072950a2c8eafd1019dddb1f6771d1cff0 SHA-256: c0bc8a49d8159dd05b52735081efe654fe60970c8c4d4c4eba07dc29d56a7aa7
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://jshtextile.com/UserFiles/file///rakavananeruwoporewezig.pdf In PDF document text
    • https://amatnieks.com/pictures/image/befur.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/29807738743.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/62438815619.pdfIn PDF document text
    • http://iphysiology.ru/upload/54006616810.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/13236823516.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/69495353847.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/mqpaogb5pcr5kt328f2oe76994/85738782193.pdfIn PDF document text
    • http://concept-art.nl/app/webroot/files/userfiles/files/bunaxowiwamawox.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbce8e4c49---geberali.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/jilematupekefirape.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607839b23cbfb---86490660782.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa1672073---7485021357.pdfIn PDF document text
    • http://domplus.su/userfiles/files/15805233328.pdfIn PDF document text
    • http://dnepropress.net/files/file/81118176050.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/fasabo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/811e84ab2c9f596d1da99f9843e17433/xexola.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/76938828611.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/74340151644.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/tmsm2cgpqdjpjdiqtbeb3rl9fu/xafipelidudupom.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/linuzanefedubirobasiwipov.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/lifidafomowuwixutepi.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c837afc90---zemebufiwigojijelix.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7v4i9s181t29csl2oap2ddphr8/rogilive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hunting+airedales+for+salePDF 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_off000124e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E0 10620 bytes
SHA-256: fd9e78dc58b3a0b19956048dec8317b55c0de6a7e90b33d4daf371ca913a4642
font_01_sfnt_off00013d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D04 17988 bytes
SHA-256: 3b18c284d5c7d67da861bdd75f29f0ebbe7a16d2535ef459dcbd02d9844c10f1
font_02_sfnt_off00016c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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