Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ffdf9973ca175d…

MALICIOUS

PDF

62.5 KB Created: 2021-06-24 04:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3c0b85075d8f534cb4d1ca1b240c9735 SHA-1: 10465a25101cf4cfa50b0e01abeb652accb2a47c SHA-256: 42ffdf9973ca175dc294f99443a2fd006e7f4531ba7707be7d235d48b0a8ab75
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8081

Heuristics 5

  • 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
  • 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://laborke.ru/uplcv?utm_term=joint+frequency+table PDF link annotation
    • http://bagiez.com/userfiles/file/dabosuluwisimewilubod.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/fdv3rta3sbtr5953qbpsdtf9s5/13808564496.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a40b0cb7---kusukugikur.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1hg81vt54m41sp8hlhch55rjq0/54094376285.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/5hltfe88fhuf82v2op32gm6puq/vikoxanufomipegod.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/75291039161.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/387c3c7bed4cd21943e3e8e157b80166/4985748066.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb327f1bd---bopokorokigifawi.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609846153f363---tifosifuwi.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/1273871599.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/56808079625.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9ffc6b0f---4503841722.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/zenipumirugeje.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/vixazamefajazaganun.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210610011552_ktpbau.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65F 4936 bytes
SHA-256: a48a097c0e7c996f79e00cbffde0d82156f350101d1c23827ca59e017d379e2e
font_01_sfnt_off0000d743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD743 11776 bytes
SHA-256: 6123d19f8f3934ddf461cbb1d63fcfca4158d8037c43645805bc42e24e54e897

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