Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6d7018bf14a178…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 13:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 208bf40377735ef7d091ba69cc9f1aa8 SHA-1: 5772095348280a4cd5616e5d3eef5f5bbed5567c SHA-256: 9c6d7018bf14a178dc862d7c28c338ad5bd500ffa43d73a0881228dfff466358
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URIs and links to potentially compromised websites, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly indicate an attempt to lure users to malicious content, likely leveraging embedded JavaScript or other PDF exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=game+android+berdua PDF link annotation
    • http://shijijiaming.cn/filespath/files/20210917211434.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/rigufabopufojalabidenew.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/tatawokisanutezaxijari.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/rpinf7irsl32si43simk268pef/vijudazesemavosoteju.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/sugasuzet.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/sukurixobiposeza.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210922_225534.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/18903391795.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/sipiwigugofa.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/fobodewogekunaregijuzad.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/nogivejilako.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/murejawu.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/lopujumotidotamurifo.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/relinigofolakuvoba.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/tu0m71eqe81b2q363ssguodoc2/13075798535.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/52131764630.pdfIn PDF document text
    • https://buka.ru/sadm_files/pojamexugogujatadufif.pdfIn PDF document text
    • http://normel.org/files/upload/file/kasapidurelubu.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109111749332565.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/71600505170.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/50182692248.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613580b9a6282---kejavaxuba.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_off0000aeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEC 16916 bytes
SHA-256: d545bb8ec77c94a2f4c292ac27fa6ee1c961a3615a24d4ae5dbc3c093df54a06
font_01_sfnt_off0000d9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 10376 bytes
SHA-256: ae4d4323e93a535260d3c1fbf125ce069fec270c5d1ea847250f82d00d50ba38