Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfe79bdaa0194c2…

MALICIOUS

PDF

89.8 KB Created: 2021-07-31 03:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b97a62f331f3c581b69e5d3abbd9b098 SHA-1: 2a785eee6762d19f323425e2191083dcbd5f5ecd SHA-256: 4bfe79bdaa0194c294a1dd8fca16a90dc36cf0faf0d5168068048623f96a368a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to websites hosted on compromised Content Management Systems (CMS) or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farms suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.bash.cl/media/file/labusaxu.pdf In PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab72e1743a0---29216091151.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/p36v179ghmhcd1pfbm9i7kage4/zigarudevamuxuvepegobi.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/dixenovisig.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/60869023132.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/fo142l1ksfq4lbkauskjco5k81/49734059131.pdfIn PDF document text
    • https://kede.org/userfiles/file/26493499794.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/latemiwolebusopiwe.pdfIn PDF document text
    • http://candientushinko.com/images/file/xejefokuvumaj.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc62955962---xazorumelefididorexiv.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/81244938942.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/8r8gu09mj5st93fcddpqbvov2d/rexalawewovevirukuwuviw.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1edb541cff---bivigizumudube.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/a4e764c25d5f4ec6524ffdb0c4621142/95414973632.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/23cdba46b1859c8fc82718e87a50559f/68956768053.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/2irh7ucurov9dbsgneu5mkviq1/fujesakigaguwi.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/litasotuguzabanira.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/56547703840.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/33886217420.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0af5ac99ff---19654167944.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/tepagunotivitiviriru.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/58822703440.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/87776215174.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fe2752b03---8923478640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=convert+pdf+to+dwg+dxf+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 17004 bytes
SHA-256: 843cd813df273e9fe2ba4cea1dbee73046e87f920789fd17e7677d370a8c9ccd
font_01_sfnt_off00011315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11315 16076 bytes
SHA-256: a671d37c7b3b889284622d243fc9727f378cc914a66da79eb58e164c6b93b0ed
font_02_sfnt_off00012837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001404e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404E 10488 bytes
SHA-256: 01c394ffc843f986abb4b299d163bd5b17aea1f9cf2849b85a6f636be64aaba0

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