Malicious PDF — malware analysis report

Static analysis result for SHA-256 950a1cbd38ea0610…

MALICIOUS

PDF

78.1 KB Created: 2021-09-12 14:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 514b6f49aa8b9349f20b3645d139a849 SHA-1: 1d333180d69f6f6781833b6e9a7cb1b358fc9fb9 SHA-256: 950a1cbd38ea061095dfa670f535aab112113b5894efabea869d04df215979f4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://shoreluxurylimos.com/userfiles/files/voxitomibivov.pdf In PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/fokife.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/48717862181.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/9a8ja74cdi9mibpt2rs19pkei7/xalevixafuzaxuse.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb148b03d---supovexiziz.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/dekemitibunet.pdfIn PDF document text
    • http://exima.kr/userData/board/file/7237667782.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/rewikisolelem.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/43288670415.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348000b7c89---96578889974.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/48236885799.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/loboripagomafike.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/samifovosizadi.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/drreqaalorlabv4dps53t62e48/30792731077.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/86709887167.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/nesanowokodonodirilalebi.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/96043794056.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/285988818cf931169376ac2c21625144/33997895335.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/jarer.pdfIn PDF document text
    • http://yongqingtech.com/d/files/jutitowunekulokake.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613810b3cc782---71249464805.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/60571467817.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/44837321711.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/69614915621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cool+games+to+play+unblockedPDF 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_off0000cc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC85 11140 bytes
SHA-256: 5150c5aa702f24e8420c0d5f81ffe8ef013d05f5766a98351ea2d1be10355992
font_01_sfnt_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4D 17284 bytes
SHA-256: dfceda6d68bf0a8f9512f4863c180fe887ce302bf93b97670d03fbb810f1094a

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