Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46259b087e7bc12…

MALICIOUS

PDF

73.1 KB Created: 2021-09-06 23:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 438fde291b3bf274b93dfbf6d2a447f9 SHA-1: 94da074b352510e56aefe81b219b942b9720a65a SHA-256: a46259b087e7bc129a5b64fc6d4b782b0b99b11bb62c06e03ea8033a3aa4f16a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting. The presence of these links suggests an attempt to lure users to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7342

Heuristics 5

  • 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
  • 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://crysiq.ru/uplcv?utm_term=geekvape+aegis+solo+manual PDF link annotation
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/58703503656.pdfIn PDF document text
    • http://www.bandungmesin.com/file/denavipumulokos.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba90bab68c6---zulep.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/worug.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/dukulivonitifen.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/pesizebekilaparobinofeg.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/domure.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/19a08cd68059caaf027f5dfcf1fe74e5/71157051047.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/gilugifaxeda.pdfIn PDF document text
    • https://derfo.info/resimler/files/vaxefobevogam.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5b1b4995a---34495103578.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/tobugipexunuzimu.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/96045336006.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/bibax.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///pasarafusavotuxovakugamef.pdfIn PDF document text
    • http://www.grifin.sk/files/niserujurixaxebuvaxaluwo.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/9209387022.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161127746989f0---lifonudubopukawu.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210628_5F44D91D648242E0.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/zokedigozuritubaj.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af7f9185ff6---noboli.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7E 18248 bytes
SHA-256: fcc8d979e7cdbd1670af44904a5c51254b0aae00acf5965d4c061022f59fd853
font_01_sfnt_off00010ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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