Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7af033f1b5589c2…

MALICIOUS

PDF

85.0 KB Created: 2021-09-03 10:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 128ec877f681c7c41c6bce9f4ad755f9 SHA-1: 990e9b68e726fb0c486f4887af7d41577ceeafb7 SHA-256: f7af033f1b5589c220f88688678108e33b39808ca782f212222b43f3d2d78271
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://birzebbugastpetersfc.com/files/file/95477344982.pdf In PDF document text
    • https://htchninc.com/d/files/derekagej.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/588106163081627780178.pdfIn PDF document text
    • https://topupdana.com/contents//files/83874244253.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210508232925.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160989f0a8e39b---vewusogagiwevavanu.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/17160476305.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/pujifirivoxazexi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a51d8e2ab8---48828014876.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dbee437c4---jamaxavimofowa.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/38600158140.pdfIn PDF document text
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/1517053707.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/xosopujafozuxarorite.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/38754573996.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/54488876256.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f36fc9b988f---noxagam.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/a9460644656eb215eb7a4410fb3f47fb/39166024996.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/dilezabebuwobofa.pdfIn PDF document text
    • http://saktigroup.in/uploads/95364070338.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/kawuleveduz.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075c60424ce7---firokojobi.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/20540301222.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/zadosirusewukogegeli.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac193ae368d---19205814668.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de0d6d6b51---kakesarerati.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/0fb64681ae873e362f58146cfd7728b2/goseziwalorivisijozo.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/82450475020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=2018+nissan+frontier+owners+manual+pdfPDF link annotation
    • 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_off0000e64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64D 17440 bytes
SHA-256: c372f46bf8fef962f14634f4962be3db2f586d0b9a9a52188a04af1f42c0f7ac
font_01_sfnt_off00011387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9E 11248 bytes
SHA-256: ef94951bd57068b7b2c1a643de2c56f104eda18e2b123ca7437c07d47318293c

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