Malicious PDF — malware analysis report

Static analysis result for SHA-256 07098829d64949b9…

MALICIOUS

PDF

80.6 KB Created: 2021-09-14 10:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 330b1bf489a721d07c23fff76e0ff56a SHA-1: 8f751a13f99b9b21fbdbc2a736035be103281b3c SHA-256: 07098829d64949b9739db4ed213ac270150706e67f57c6d5f2eaa2f796db901e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://garglob.ru/uplcv?utm_term=read+receipts+android PDF link annotation
    • https://yarpaket.ru/userfiles/file/45260821977.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/redemudojowafigidu.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/83233137127.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/lawumipoduvinoxupikiwi.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/69842934195.pdfIn PDF document text
    • http://yilip.net/userData/board/file/28109928902.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/vubifateburu.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/xuzawenogatinaleru.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/masor.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/85102452971.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/43070157951.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb61a99981---98417371388.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/vixuxisojan.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/jonozuzu.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/b5d51af19f50b46a7cec96aafad944d6/39156955334.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/zutufajasojir.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/silamegovufakad.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/34994563469.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6b9ee204e---nisidozapenas.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210907070855.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/rukewelejiburi.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/87606718838.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/29887386207.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/lukiv.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/97539732486.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/36809254843.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_off0000d6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D7 17760 bytes
SHA-256: 1f4f8c3da19ff024ab392c105844e203c3c1d52a29662d203d49dcc01cc1175d
font_01_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D15 10508 bytes
SHA-256: 8b5c7cd6ef64933ef22bccb20b8da232998b6ff4385c8e9370fff9c51792e8d7

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