Malicious PDF — malware analysis report

Static analysis result for SHA-256 744568a596d1a37c…

MALICIOUS

PDF

76.1 KB Created: 2021-09-29 00:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a980f47c09a239f31618c5c21b350f8e SHA-1: 9e029d3139185cf2b8964e1c9cb295b22f29b603 SHA-256: 744568a596d1a37c5e4b50eb420a35284081dd401bfe916bbc59124dad366a3f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious files or phish users. No scripts were extracted, but the presence of numerous external links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dinskayarealty.ru/media/file/91880691895.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161440d73dd775---43961367239.pdf
    • http://clubselectionvoyages.com/images/file/80225942324.pdf
    • http://www.pics4us.de/userfiles/file/dujilazibigebajimijojuz.pdf
    • http://elektron.be/public/userimgs/files/dekag.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161410f624e07b---jobob.pdf
    • http://gamebonda.com/ckupload/files/37994247835.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/3775c41f3b0254ad2895ecb29e096814/20402074120.pdf
    • http://merwepizza.com/upload/file/potawuvesepuziwelu.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/82275547580.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1fd4b1431---zidukonevizem.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb07a7214e---tatevidom.pdf
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/32704584344.pdf
    • http://aroma-es.red/yamituki-n/uploads/files/83264511379.pdf
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/rejaxup.pdf
    • https://maintogelonline2.bet/contents/files/xalapebeko.pdf
    • http://poltinik.ru/userfiles/file/47369428261.pdf
    • http://rehahomecare.com/upload/editor/files/42057167804.pdf
    • https://rhodium.vn/uploads/news_file/32296916407.pdf
    • https://virtrade.gr/userfiles_lybo/file/vowitemidapowebidewi.pdf
    • http://pokemom2.com/uploads/files/jitoduzu.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c121c8164---813168107.pdf
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/37473268526.pdf
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nufevalexajikorazi.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/a88hub0hl8ons12kpj72q6hgsr/rolunaxife.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=picku+app+download+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c447.bin
d1156d3ee39793b24fce68c1fba8ab766ec93ceefca2dde6c5cf9754e38fefd8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC447 10288 bytes
font_01_sfnt_off0000db8d.bin
12b2218ba571befd893517b751c999d426070a0a6ee45dfff1253084c5a105dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8D 18204 bytes
font_02_sfnt_off00010a85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A85 16792 bytes