Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91dce9204cf4e4b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 22:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0234378c50cc9c520f82b7d8965386fc SHA-1: 2861700bda8ef293df2c1cdaefed09cbd3d3a899 SHA-256: f91dce9204cf4e4b7e2db2fa3eb070e76b285a6db30cdcdd2e6b19680bd7c9ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as 'https://garglob.ru/uplcv?utm_term=magic+tiles+3+mod+apk+vip+unlocked', are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=magic+tiles+3+mod+apk+vip+unlocked PDF link annotation
    • https://bangvetthuong.com/luutru/files/26614699890.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/sifabaxulilul.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/lojixetokemupasapuzever.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161390e32b9e29---89068923207.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613356a0cba66---46397325276.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/62816766783.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/20189594758.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/xosupesogivurimajej.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/boxetorebawufotif.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/74263279124.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/gagogewulelaxekilufub.pdfIn PDF document text
    • https://istanajp.com/contents/files/49832543828.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/93539079123.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431b87e5fc2---xakonowuv.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/kodefumojimax.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/dolodanegebivesetol.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/18211293486.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/fekava.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/joxogezamoku.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hleuor3l3sbcsspf16j3ovi27s/12517386893.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/573302605.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/vunabaza.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd72c144a4---83787711103.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/bebipazuxaso.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68229072413.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_off0000dbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 11180 bytes
SHA-256: 44893dbb0e7939b5ad083e8f14366387358059a564d4a4c52d4e40b3e0b6a2d4
font_02_sfnt_off00010e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E09 18024 bytes
SHA-256: 016703c7cf77f3758461e43709e4f507ee2d5b7f94db777b1a03d153bcb70e52

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