Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbdad46c64f01536…

MALICIOUS

PDF

81.4 KB Created: 2021-08-22 01:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e87f9e83245f5bcb9527744630bd5e3d SHA-1: c5119dbdacf7b2a7423ed83410fd9dffd1613d69 SHA-256: cbdad46c64f01536e9f6bfa2f873eaf81f92a0bdcd85258e352adc7deb469698
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/8c34f6aea669143184717ca93d3b5a54/96552876053.pdf In PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbfa36d268---koxuxexetosivilow.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/84474186718.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/gamunilevur.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/62103486428.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/zizamekibobene.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/79124880015.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/zewixiditexobamilutoma.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/6mh1id53t89402pbfvmv4o3562/zoviremejux.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/j7cprki2h4qh2csauf1m0p09i0/gedogogejiz.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210811_783D3C7720D139D3.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2aadde14c---57234905010.pdfIn PDF document text
    • http://glcore.net/ckfinder/userfiles/files/77175091346.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/jewanonamukem.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16072889c63576---18429898885.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/96022154711.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/32e3fbf463ebcb215a2b1e9feddea968/zexeke.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/8b38f6f6cb772ef6db1a5b74a0e397db/gazivinokatu.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089fe3c2fd0e---73650617013.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/52920479927.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/tezotizekurovuwatamu.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/1681042816.pdfIn PDF document text
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/62374745506.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/4aaaf2ee79a3e3aa06e83174e8bfc991/36815292276.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/44522413135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=exercices+sur+les+droites+parall%C3%A8les+et+perpendiculaires+cm2PDF 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_off0000c1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E3 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off0000d7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 11136 bytes
SHA-256: 15c409af031a435c986ce2df8a5ad45d34b51d61ac7d658d4730cf090e2d0456
font_03_sfnt_off000109bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 16700 bytes
SHA-256: d1b6c8e4dd18ea5d8999ba3082894392d0f24ef3ade7f6b97a3f4c45800343cf