Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd7ad5bda5a96ec…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 21:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e4965486b0da1272402304f0bb6e6d24 SHA-1: 4968b9c4b2292051957c573fe8c4a300af9e3cd7 SHA-256: cfd7ad5bda5a96ec152684cc8fa09c3dd709b0455ad27df936c4f863b31620c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised CMS upload directories. These links likely serve as a link farm to redirect users to malicious content or further download stages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=how+to+restart+samsung+android+phone PDF link annotation
    • http://gespk.com/userfiles/file/21609386485.pdfIn PDF document text
    • http://opersan.com/file/daloti.pdfIn PDF document text
    • https://phunhai.net/upload/files/vimaguxujewededilaz.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/37506261661.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94038144161.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/10872515660.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/zawepunut.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/82256977500.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210904153800791801.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413f823d4a3---44102623109.pdfIn PDF document text
    • http://dgkno.cn/upload/nogigomofukotolik.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/xinikidozinujubilub.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614168799b5b3---sarizilapumezilajejoli.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/paregagowa.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fa0fe5187---25912709050.pdfIn PDF document text
    • http://selidbe-beograd.info/files/jipusejojunusegavoku.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210912170724.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/20495306739.pdfIn PDF document text
    • http://abwva.com/uploads/files/sajotiwojerasawim.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210907111900.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/o7rmf5l06vejhgbacgnuf6dp44/kefazizojo.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/50896946796.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/36875065309.pdfIn PDF document text
    • http://taigesw.com/upload/files/7376334077.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/gujakikizimofujigijesinow.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630696224.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_off0000e20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20E 17916 bytes
SHA-256: 227bbdb0c50b0d5210e59c66cace4b97821eb22a06d2d632ac02acc7acde713a
font_01_sfnt_off00011109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12920 10972 bytes
SHA-256: 7da727753790f63ba7bdd2ce922cba40493b8a1991614233a07fca9df5bc55d1

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