Malicious PDF — malware analysis report

Static analysis result for SHA-256 407087b48d31797c…

MALICIOUS

PDF

89.4 KB Created: 2021-07-06 15:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bcca6f7ae504f2ab18774a5f976b5854 SHA-1: c618f908d22c54bad544c92ba561b2b96553c913 SHA-256: 407087b48d31797c2114a6dffb5564c4e35e761b309469410be5caef48a48784
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and UTM parameters suggests an attempt to obscure the final destination and potentially track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=baby+boy+names+with+j+in+telugu PDF link annotation
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16089b34abc981---48765111901.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6085345439---rakoxezogupisuset.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737f23813b7---58452753201.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e0ad8f2c8---21862522444.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/85321907605.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b09b207c52---18296410243.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/lmsvbrnla1hi8q8ai8ioascjr9/jabonuwutafomib.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/sasedituru.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/46094153697.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e6b291c1de92f6c11d1cea5f68f5bed7/lutemixisokufuka.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b795be4957---52733226667.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/obqp8on26hcmg9mg94f064ecs3/lotaguzo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9u7hhf9sfh45lvl50ecbdl37i9/dafibape.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16099861733445---kapilidisopepapala.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/d7j284f64289ntt5v7cjdfkcg0/77193075225.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/gomukused.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/90750680514.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aa95a75a6---wikijomagatomodi.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/5273bbb6fe2a4e94567b99e220c0fe96/64210860229.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/37822845270.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160942004bd3e5---xopisimerafadifadit.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ff2e27c4c---dufavifamiv.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/5iv0598bae3otq1nsv6admbq3k/87042168693.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/gagexeb.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_off0000f90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 17404 bytes
SHA-256: 2646ef28e5e9e8d6abf4cac6b6708149ef63a69b7264d437daff9fd910375f4a
font_01_sfnt_off00012674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8B 11076 bytes
SHA-256: f77a2caf49adc03980c53b3c7b8862fed4acb385b6d0c1ab7e9fa3b7d6898732

Open this report in the interactive analyzer, or submit your own file for analysis.