Malicious PDF — malware analysis report

Static analysis result for SHA-256 c251ea22dd914dc4…

MALICIOUS

PDF

73.4 KB Created: 2021-09-21 12:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d02be6fae0e7b5886011974671a324d SHA-1: 146611fe2b8646a31e1c2777919e53e2e7509033 SHA-256: c251ea22dd914dc4b05a8e3c7d8696f1591d25b15ed85a46174fb0448066d419
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites. The embedded URLs, such as 'https://oniceh.ru/uplcv?utm_term=how+to+get+local+stations+on+firestick', are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=how+to+get+local+stations+on+firestick PDF link annotation
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5d3900dd4---35131908661.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/38430321979.pdfIn PDF document text
    • http://aromata.ru/upload/files/32934170768.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/kemekisasaxijumoxejadeg.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/bopewivaretorojijabinop.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/23951012342.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/vudofekawefop.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/20967208927.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/dorupaxilinodijizaw.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/petegedemokitiwijezux.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/76239440860.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/xixakevibotadajerijipi.pdfIn PDF document text
    • http://01host.ru/userfiles/files/61792770370.pdfIn PDF document text
    • https://laps.pl/userfiles/file/wawagoda.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/72641101801.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1614467145f2fe---95400824426.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210905_A2AC957CE20CFB8F.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/91012468088.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/lukumidabames.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/32065220660.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/befelepafogoxifupuwuvawe.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131085f85034---50787716667.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/gesutevaba.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141e38b08273---20375424590.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_off0000bdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BD 16380 bytes
SHA-256: df38dca064998ec1b1376f858ea9c19c50dcbceeb5c04a371b45155a2a0c054b
font_02_sfnt_off0000fff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 10680 bytes
SHA-256: b0c671af153df2c0dc4faf20a6bec118fb688ced2327a204204b220be4296b10

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