Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87f345738dc9838…

MALICIOUS

PDF

72.2 KB Created: 2021-09-03 02:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6a5427725b8bc658aaf0494d97ecf15 SHA-1: efa23670461d638585d3a875b919b597a83e9c6c SHA-256: e87f345738dc98389fdb71f5a1511ee7d478bcb1a61a6d821b5aecb66deef029
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised CMS uploads or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=skanda+purana+in+tamil+pdf PDF link annotation
    • http://msslink.ru/userfiles/files/99166277593.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/tobiledagepuk.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/tagawek.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/cd7369eeb3cb425e4ebc12fd9314b4b3/wekadifiwojejajosinawa.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/lv8a2f6al31d3dts4vbhhjumvj/keveridunuba.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/26jhmkqkvcn34m3k2hbhkr6o2n/31885916406.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/738ef5f7fa31135e42310bbfc29a8acf/labubekavavojasesesaf.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/33291642063.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/e188630635db0bd1fa687aff389bf478/88523114217.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161286b88bb98e---vitokirolitizudozovaxod.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/31592264177.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079f73591633---kojerajijodisanagokigaw.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/fiwotebuvegelar.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/likugiv.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/61514977708.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b540962fe5b---90862663088.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f69f00994---30551201334.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/suwinozaxidonedegixulu.pdfIn PDF document text
    • http://ruresept.ru/files/file/54153434140.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/binixebo.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/82804808423.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/lilowu.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_off0000b418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB418 10504 bytes
SHA-256: b09b77b45d874df3a80b5e5614cfc76b606c20feac5506d7ffb8f54686a8ccd0
font_01_sfnt_off0000cbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE8 18304 bytes
SHA-256: 6ae7a58bbb941c0b86df2bace9217532f773684097442ee0f468ab00453582bb
font_02_sfnt_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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