Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ee084188bf3d8d…

MALICIOUS

PDF

74.3 KB Created: 2021-09-01 12:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: feff7d26d493c3ecc1d4ecdb831fcd84 SHA-1: 264778be4f8688dc0f8c6b32166a3857b2e55ba5 SHA-256: 88ee084188bf3d8d841caee8463ce44228bf62066a00d1eedcb969c62528f4a4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://philabc.ru/uplcv?utm_term=is+spinach+good+for+dogs+with+kidney+disease PDF link annotation
    • http://arabic.cz/ckfinder/userfiles/files/saxabexelomakawas.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/22887925817.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/a407paj6m9gpl5s295lrg63c7r/vesuxarokunujemixowotos.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3db5c8acc569861fb2bc450329adb67d/wixemexijimimewalugibixaf.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/95673475232.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/20939523084.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d19f71a067---tokisaxasezizutawapuwa.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/81602019691.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/634e7khlmt2s8pihtmo40kkrlr/simiwokivubagutoverarok.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/dobijujil.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609596eea91b5---roboxifusetowin.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2bf6d7963---8542615518.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/xejebenemexosuturiligixa.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf00523d5c7---27976680875.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/76753817487.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/xiwulekinedonivutobubip.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/jurowedozibaposexavak.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/90107816991.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e61544b1b21---dusase.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55245470476.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/koduworomijupasiv.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/67243325577.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/56561256397.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd41e47c9fe---63731089282.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/e5b31b7a5f40a24756471e341588cf8d/63263367680.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_off0000bfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAC 16376 bytes
SHA-256: c20c08174a14dab87de9208edabe70056aa79cdbd27b93860d1ecb75e92cfab8
font_01_sfnt_off0000e934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001014b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014B 11096 bytes
SHA-256: 03f28a3b5cfa8cbbf62840b8ec7ce888e7ca722df5020c0785407be9b11d0184

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