Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80e08922d98243f…

MALICIOUS

PDF

86.8 KB Created: 2021-07-03 12:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d9bf689bf9d835efc0d5f6fd1dd17755 SHA-1: 2ae00ea88178c7fed38293d8acd488ee128f4314 SHA-256: f80e08922d98243f63ac9d40fd5448f9dda226e60f1b030f1d4b8d582803ef54
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. These links likely serve to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cructi.ru/uplcv?utm_term=countryside+quiz+questions+and+answers PDF link annotation
    • https://livre-art.com/ckfinder/userfiles/files/60101211273.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03e8a88e8c---15989263831.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/c8ac5502201da8d51490aebe7dc95db4/sexogejazetako.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/77127436030.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/pusopijadufazuduzoje.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160999d958a0b4---rosowabemewuvivixaxotulox.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/kotazar.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ade8edd036c61d3636b2401daff17b45/tukivozidazepoved.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/46068594720.pdfIn PDF document text
    • http://dzbnf.com/upload/file///mirazawojinorilevu.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3a7bedcf7---11133046690.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210527_F01DDF8013FAAA7D.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/10065750261.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4344154fef---fibevazozejosomotamore.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/54632754491.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/fb7a726757d990cecae0de8d45a38192/58584860235.pdfIn PDF document text
    • https://airshow-bg.com/file/majapenafinufijezede.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609041304ca8d---baronevip.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/74690772259.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c9ce0cf5cca56876e1a2cb0f0c8d043e/derelepenoxoxuvotakotumin.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/8eb76620b66df9b0ad1232dde58ab5e2/75064426979.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160916d09c848d---rezatake.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/011636607c016faaa002b5cb5e4935b7/7934824687.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_off0000edb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C6 17912 bytes
SHA-256: 8d9deb0b63e03c173d0701470f86a22ee2cac61a80af9858469791d72f30e269
font_02_sfnt_off000134fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FE 10732 bytes
SHA-256: 84f02b3163af18835f2ff9b5f8fb7fd6ea2d3da4e455efcf581d31819de96840

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