Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac59d2c32c7f3d9…

MALICIOUS

PDF

87.9 KB Created: 2021-07-31 06:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee5ddb83cbd19033b3d5f95be05d2448 SHA-1: 016befc4823b4227cf206a7a42da261f9009e425 SHA-256: 7ac59d2c32c7f3d92a90866a0879744e717d5aa8de806b09ac5410352e387e23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm to distribute further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://laborke.ru/uplcv?utm_term=jazz+arpeggio+exercises+pdf PDF link annotation
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e9f0c13b6---gudamunipok.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d116797529---30388221935.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/kenujulobotijakajanal.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210713_6A40E4F2255A6D03.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/21018876413.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/zufanudapororod.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/17846112206.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/81d388d09244a23ae1ac37b4e67f5100/84204328908.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04870deb1e---luvexazisenibokivakizeg.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6fade6afb79f08c3b1e1c218e6e11021/66051894753.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/poxanorazuvedikalukeb.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da59aa8239---dejukevirokuxafijobek.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9f4c53008---47008450792.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607987b71ac6c---xorekukuxelidekodi.pdfIn PDF document text
    • http://www.celso.org/download/kisas.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7f77629ffb4b223752f9aa3ecab03a2a/99683498512.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/985688037d220ee70b37a36702ba3c95/3254620801.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/bd7b5745a1e9b94ac2d5df2e5270cb83/mudesuvorozoxabunax.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/10587432909.pdfIn PDF document text
    • http://domplus.su/userfiles/files/22284100120.pdfIn PDF document text
    • http://beliangka.com/contents//files/muteforirobobili.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/62839738198.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/majot.pdfIn PDF document text
    • http://simpli.ie/survey/userfiles/files/wotokufek.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/98497757735.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_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 10700 bytes
SHA-256: 069479a6b52763240907c8e13538ede7ff59a6a4a57256db337095870e8aedce
font_01_sfnt_off00010dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EA 16576 bytes
SHA-256: 58464eb9b6e4f9b2e8f7cb328c8413ae2027972536bf34da2e8eab41cce53ade

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