Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c2ed983d6c9242…

MALICIOUS

PDF

85.5 KB Created: 2021-08-17 06:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 87e0b46501bab147ef0981b48999bbf8 SHA-1: 3247ccbe309e1a6a075343ce88cd3bed9e04eb96 SHA-256: a9c2ed983d6c92421abeef7754be74f3a43f24b338228d1e05be1c8aeda6c15f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pistant.ru/uplcv?utm_term=a+cuanto+equivale+un+nanoculombio PDF link annotation
    • http://soft-pro.hr/upload/datoteke/gisowotuxenira.pdfIn PDF document text
    • https://redac.ch/upload/lojanisaregopa.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/12250161626.pdfIn PDF document text
    • https://subded.org/userfiles/file/mawemakewogotubufotidamuw.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/97107208969.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/pamimakupogetib.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/sebozuvulesatesasur.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/raguzezukuzajukilazamike.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/33132334143.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071ced7317dd---tezajasidogelanulemirope.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/tududo.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079b259287f6---rikalalu.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/77116927149.pdfIn PDF document text
    • https://actorconseil.com/files/file/1630616358.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/57560198744.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/gixukujalodipaxijirage.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/45008803988.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec40ac4b2b2---65849263346.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/58607276386.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ba295c55e94---28150145465.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae468166b---bazol.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/99b48b50e1d6b118ecabf7776af9e48b/16463775927.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/24573122799.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/2a89b5306b2ad4fa78743a6dc225aae6/37197388153.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f7947c754---2730068178.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_off0000e3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBB 10556 bytes
SHA-256: 49d32126f751369956a5fb684cc63d3059ac37944535a54900eac2d8f97ce266
font_02_sfnt_off000113d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D5 19744 bytes
SHA-256: f60d895c229fd1556acad5c881f2ad327a19ed0fdc44abc3b09bcb2dec414292