Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc88a527fb83d033…

MALICIOUS

PDF

85.3 KB Created: 2021-08-21 15:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 63fdef062061ba4f9dcd5ffd3a8d41ba SHA-1: 02e7ef6d69cda306ec9c99823bae3bb4deff2ab1 SHA-256: dc88a527fb83d033f71709531f5abb4bdc1545a462a61247a9e9ea59cc750c54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be redirecting users to external content, likely for phishing or malware distribution, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=the+amazing+spider+man+2+apk+and+obb+offline PDF link annotation
    • http://libertyquad72.fr/userfiles/file/nuwota.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021072415094773499.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/90140592992.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611cc10dea43f---papalomivofibalatolar.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b891770bd1---zaxoxulimofozefani.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/93194762558.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1224f80cbd---difikobulubepebubelonebu.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/dfaf00387d94aa98f799ee8e73e9b4b9/14170509393.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/sufadofujifinofapotatutoz.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/suvifux.pdfIn PDF document text
    • https://irantruck.ir/data/file/befipikufose.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/94859793885.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/95239369316.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/ac667f65bed555e421e4f85317a1aed5/nonadenobalaguru.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a715f326606---xowupibabedoxumu.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9935d977bf10da5ac2c52d0de0bb50a4/nenimerajetisaviwamuk.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/71893069438.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/lamozefojifud.pdfIn PDF document text
    • https://orrizon.ru/images/file/85261786537.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/komomijilitasujululer.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b77669454---wiwijisefixitanenozusizup.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/31956752800.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fe2edd239c---69974611607.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/19390846967.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/1a4d1da14d412a390ebebe2fc002e2eb/dalafonovonofukok.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/81da427583feb3ab6f3da8818db64d43/74308040739.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_off0000e8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AF 11220 bytes
SHA-256: 2f5fe21bc4e332424b3a6f407b357147a7b25f011087b2d9645698a28240b003
font_01_sfnt_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 16832 bytes
SHA-256: eda88aac4d7fd913d2ded944ca14ce852bfb08943b6b2fa32198003984de4749
font_02_sfnt_off00012e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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