Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a88fe1c2f9ff90…

MALICIOUS

PDF

70.4 KB Created: 2021-09-18 08:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cab5727baf9305b489f518a62f7d6ebc SHA-1: f0a38ecc77742a8948e2701eb3d9259085ff1b71 SHA-256: d9a88fe1c2f9ff908ec2af1a3a7ea3bfcb4034b8f282fe5f0031f7165a19b429
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous external URIs pointing to various websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=psx+games+download+for+android PDF link annotation
    • https://drinkpoint.com/uploads/files/11846714876.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613feefa01239---pasojuvujubuf.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/53909387246.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404e13d5639---31497004931.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/24463136494.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/fukoz.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9svqaqadr1qi6l98t1fdufr4dv/wopudifijefot.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/23495933652.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9d0596964---dabofebupalujunenakosuxip.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4f81c5d83---77379579950.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/wazotiwibitemasawi.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/nijusetufesopowefubi.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/81693690323.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/talepevusojenedarogulu.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guxifavasoluxofifejade.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/sutusajutegetajilu.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/91602839312.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/47460040070.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/gapufiligibeloba.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/35052728841.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f99ef73024---7057266489.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/udcos8ckjdgpj90p4ouhotmvoc/safunotagosenejodalaret.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161408ecc1c5c3---82704916722.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/51023ff9b3de3595bcc15de6822d7850/fesexazisalu.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_off0000b50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50F 10788 bytes
SHA-256: a53a75c8e2bf5dcd41a5d8cc325b9e2c7923b496277d181e6617a9ccf1d5e6a4
font_01_sfnt_off0000cdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB7 15100 bytes
SHA-256: 286f879b63fbc5a4ff2c7488c855e7c37ac5be61e0e62c8dd2a11bf15ae447d7
font_02_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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