Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e8234909d3e899…

MALICIOUS

PDF

73.0 KB Created: 2021-06-11 09:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a0aaddf829f226b49fcef5d75a0f1e80 SHA-1: 0c57ca1e3fed522de3a3eca4763e1aeabe44c670 SHA-256: 39e8234909d3e8999409db5c7f3d9f1e4d6d4b0871277fb5fb21ec245b258eea
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=kreupasanam+candlelight+prayer+request PDF link annotation
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/fa1197b181d5aa64b7a67427024815b3/gufegenavijemituvedupe.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/56d2ehu6ado88rk7sivgmekvu8/19422752647.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3c9596f56---56051266244.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160961f02bf145---16104286219.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/49633305449.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d5b9ad89---remezolefebewagotaxene.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/6ac6301ab43474f0423e97c721fe8d9a/51742287690.pdfIn PDF document text
    • https://ebooksweb.net/files/file/86271894634.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/93e2e1b0557f13bf2fb9ddab033d1bdf/94086894437.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/xabaj.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608020f42dad4---62985253672.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/53201706969.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607757404a5d7---zofagaxomofupifekavifodel.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/kaxopugovijezir.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/94046263872.pdfIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e22c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE22C 4324 bytes
SHA-256: 18c363275ff3b791782b08a206c82ef9a8ec447b9f1c5c077940d3103bf168b2
font_00_sfnt_off0000cf0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0A 5684 bytes
SHA-256: 64fe2787e509aeb9fd5d7cc6d73c5cdc83bfc7be86c6f053bdd30d7676fe5337
font_02_sfnt_off0000f281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF281 10968 bytes
SHA-256: fe748c33f66eedbd4e2af051a5cc4a704116b4f7e13d7ad2589f4ad9568dfa1f