Malicious PDF — malware analysis report

Static analysis result for SHA-256 519c543ba37f852f…

MALICIOUS

PDF

89.3 KB Created: 2021-06-10 08:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f84aba5f98cdeb82118f7e326bb08e96 SHA-1: 8930a2007459710254aa0b5746fe8f9dc91a41f8 SHA-256: 519c543ba37f852fa3441aff3f0b9ea766cbb345e387cf9dc80425cba132c824
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit users by directing them to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://philabc.ru/uplcv?utm_term=kindle+fire+hd+8+manual+free+download PDF link annotation
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/dad5837731e56277dd1490fb2c3e95e7/76098108965.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/gukavuzu.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/56504680813.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/zobusimiwotukubesifodet.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b290373a7e---dotinuribad.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/xofasebafudasosi.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/bemuvefer.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6e05a58e1---wopakosenexu.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/75047523563.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/aa07463288e1c56bab4a79b2248e8851/baxebumij.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-30/20210430182820612642.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/7gkvr9mgvjddjp9mug5nh82i67/74919332652.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/eeb84167efff55ed1ab77fe6821d9b97/50792936213.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/a8v0o9jtqsgl9b9ju5k36i9hnt/nulinavewura.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/91761027721.pdfIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5C 5224 bytes
SHA-256: d0a455895c2f2ca40c0cea65f3bac931313a970b7e082c8d104947fcdf7bdff2
font_01_sfnt_off00012e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0D 12836 bytes
SHA-256: e9548b10a5e40c0e52b283a8a40278d22e8813e399e4fa4d765200b752cd872a

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