Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf54766d81b1666…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 10:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4e0a48b81fe5b6c4e475cb17bfb93a8b SHA-1: ed1e4e4e13d6818e25a64137835dc20bff90132f SHA-256: cbf54766d81b1666d3f09495eee090fb0eaefcbcbfbb1474da3ade6831091b71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these external sites, which could host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=how+to+unlock+samsung+galaxy+s5+mini+for+free PDF link annotation
    • http://lesen-und-schenken.de/userfiles/files/nefirememepuwelizi.pdfIn PDF document text
    • http://netflor.pl/upload/File/siwexam.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/82308126723.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383a370e000---12827954225.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/kovidowaberolez.pdfIn PDF document text
    • https://kratky.eu/files/file/leriluxobowuwomozopawe.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161356adc26c31---tisinajowasonasoxulob.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/xorifaxupabisujero.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109152204059932.pdfIn PDF document text
    • https://olivermilk.com/tctt/sites/aaa/file/delavuwuloruk.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/68591012936.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/98236651197.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/fefef.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/73u2nr31nulub7cllem5jo20tm/sekulowazetis.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/93061612803.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9179b526d---xasasidotebosuxi.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/v8ot5j56s64e6lveua0c0otoeu/96598862330.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/rodedozuwetudixitoxi.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-10/images/files/duxagojigokikuk.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/b494aa8fd8641c9916ab9d93f5f4f407/54877627020.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/pumevokez.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/12730757615.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/saxatosabejagexuwuzap.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/vasurunaxen.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_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 11300 bytes
SHA-256: ee8e927c82fd312d6446a85e6dea124f2d9903ac4d7f3cf1d42b79f0cb75651d
font_02_sfnt_off00010f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F76 17588 bytes
SHA-256: cf40d6fdd346583b23d3e4f4071a319b501008aa09273506c6e96c7aa5f48626

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