Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc31287951b64278…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 00:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a712b47c4ef754113eccdee565e14600 SHA-1: dff6f4b5a2fa3dad3ab0fdf10f62d57d84585820 SHA-256: bc31287951b64278b3992a75806fa1c200e2cbd11cb3c37265580616dd50ebc1
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=how+to+see+line+chat+without+read+android PDF link annotation
    • http://veterinariacasettamattei.it/userfiles/files/berijirapar.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/dujenudos.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/pelofurufadivasonumiput.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/5fa845b0905e3bad21dcfec59b343be2/84563929053.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/53014003636.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/fuvufixafipo.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/sufegawejetidakuk.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/36066936481.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a531a92670139c7c458be8f3e063ae2/63245776273.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/0b84ec48eca8ec2ab540cfb169ae787d.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cef0913fe1---76452724191.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/lusagubobibudaf.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/lemaxujin.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/jekijetuzuxukuralepaf.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/2730628620.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/pegonetew.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/1510803330614207159e1e4.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/27055808751.pdfIn PDF document text
    • https://polandpools.com/contents/files/taserozoxozat.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/56033351841.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/lowifogefepuliso.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/japidin.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/3584238124.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/tanaxumozugitubit.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/24052063761.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_off0000d9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D9 18228 bytes
SHA-256: c8f0eddc7c01c4dabfdad7a52abaf90a2ce3ade57f50835c1c85636634299c9b
font_01_sfnt_off00010901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 10644 bytes
SHA-256: 461fdf23e0710e7b6ac93de057c80c44e3ed8e64c914d3b56cad0bf0f5f56168
font_02_sfnt_off00012152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1