Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e26a6a0b5b8db98…

MALICIOUS

PDF

73.6 KB Created: 2021-09-02 14:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f05b06a4ff7fe87948e84485a9ce8960 SHA-1: 6f4f637d750663b5b538184f230b4652d69a9146 SHA-256: 9e26a6a0b5b8db98a2e9f18c7f794d55699705caa4541719eddee33912507ea0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://cructi.ru/uplcv?utm_term=commax+intercom+wiring+manual PDF link annotation
    • http://sutphinsgermanshepherds.com/clients/21958/File/25359272062.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/25582009218.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/watijezax.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/joliwafewu.pdfIn PDF document text
    • http://huiking.cn/uploads/file/180351176446.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089b1efb3fad---79913915109.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/64252237700.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/xatoxirog.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/53741697207.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/futufusadelam.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/44524188621.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/57136830049.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/sifevobunapel.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/35824633284.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/goturikevirinuwokuro.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/85894133032.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/d77cd0ad07ce92ba6a4e42e2f3ea0a80/mikelemagitezomupu.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717d242fbe6---garebotedixi.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609869911b84d---67369830458.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/72522043316.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ruxaxogozaduxakiwepofa.pdfIn PDF document text
    • https://shinaltd.ru/images/file/duwajaxovab.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/33895210600.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/fikowekol.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/serivot.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609acda76faff---65410583183.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_off0000bd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD65 10724 bytes
SHA-256: 7f6fce0dd46243999d7f5f1a914a586d2be80cad6e36a5c3bd22783c8bb1daf8
font_01_sfnt_off0000d618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD618 16552 bytes
SHA-256: cc5ac16a2b641d7959c225a0545a106ef351354d4825e0599c967766ad88a78e
font_02_sfnt_off00010116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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