Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fa3bebb3cd352e…

MALICIOUS

PDF

77.9 KB Created: 2021-08-12 07:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57067811fc7843d3ff58167212b7cadc SHA-1: a93b4f58aaaf4de728a864f1683d0be46a1af798 SHA-256: a9fa3bebb3cd352e1fdacf80a3e78d62f779f37f74f9255319a8612649d6da42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://synerhu.ru/uplcv?utm_term=henle+latin+1+answer+key PDF link annotation
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/xuvateverepuwuvugujexi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/61d5bca041e3029ce4a0eee0121ad8b0/vidimapoto.pdfIn PDF document text
    • https://media-get.com/userfiles/files/xonivotedunizakidavugaku.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/65488680577.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/f9d8b259ed8761c69a68e350b98eaa84/subulamuzakike.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/mgak3jkug51ul7bau2kb8976cm/kivamipokov.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052207213070554.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/17059858245.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/rivogimasivasukesipi.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac313707894---devupawugedijekitosimevo.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/80317170406.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/9022370848.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/lepukosuzomal.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/mjag7730ei9idqjur36o1si0hq/rawikusabuxan.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/nabiruvetetekojubeke.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/raxifesolivamusoxi.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/pavivi.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5a2078c6dd7b83f610bc193d08877ae7/gekikitoriwuka.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021061908012693.pdfIn PDF document text
    • http://beadsandsupplies.com/images/file/kizenufuduzono.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/36721652869.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/suwimo.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114481163121---pajafilo.pdfIn PDF document text
    • 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_off0000cc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC75 17960 bytes
SHA-256: 17ba5e329803bed837f295861f7dcf61709051188d2ed6a5c612238a60ea411a
font_01_sfnt_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CB 10316 bytes
SHA-256: a40235570a46cd2d739e58a2163ce7aba65ea8fdd898ca2e1638a9b7136d685a

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