Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc166086de2acd41…

MALICIOUS

PDF

92.8 KB Created: 2021-09-17 18:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 51f7ddca6e6dc9098bebc8c9bc344cd6 SHA-1: 124b5cc4398004f3c2110e148c2ef50b5e41f19e SHA-256: fc166086de2acd41a3f3e9d87c22fcf986a78567df23988f58e1b3de344dadd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 https://drafthe.ru/uplcv?utm_term=quadrapop+f%C3%BCr+android PDF link annotation
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/57ab00d90725ecf3da800544555986df/35399130216.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/xepuv.pdfIn PDF document text
    • http://qdjshg.com/files/file/85991506699.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/foxoroxabufi.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/26431292128.pdfIn PDF document text
    • http://irinabailey.com/upload/files/46301428603.pdfIn PDF document text
    • http://mrrb.nexgendevgroup.com/files/35940069125.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/59304760749.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/rabavawibogipudumikazabup.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143f1b1123a7---94977862797.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/64936997273.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/59510688129.pdfIn PDF document text
    • http://djapm.com/userfiles/file/gikudivovufugezewabu.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/6f665ec973f40c379b02752c001b3090/23550116496.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/dajepelugo.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/kiroxunu.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428228738d1---bisexirixukewetomasu.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/636847355.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/45076509479.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/minoladumabov.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/gukimepixasimuze.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/xogetuwawedabevadi.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/gonugumokagibowus.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/jetozelasi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000144b4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x144B4 19064 bytes
SHA-256: 23badf2a5397b46308b68f96084a3a1b3247362e5cf3a39b09874593027fce23
font_00_sfnt_off0000e302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE302 20052 bytes
SHA-256: b65a241af442fc517ed95abfb4ac26109cb7bd516baa4a2740bfd3691e68e387
font_01_sfnt_off0001155c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D73 10396 bytes
SHA-256: 86cd148cfba8ae903544c7f654a919f0604563227ab42167ecf7f5a798664904

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