Malicious PDF — malware analysis report

Static analysis result for SHA-256 b160e6bcadae7603…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 02:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5865b41636e06fbe08d8f8e92529d594 SHA-1: a584bbbbd7163843c3fed3d20df54db1b2246168 SHA-256: b160e6bcadae76032ef0d3a17c6c4ccfbb9b5283da893d31c01771ecde7d7a5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://cafehinglung.com/uploads/files/zirokoxej.pdf In PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/60813177952.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/zijosunalozek.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/jewamopunezibuxijatifonip.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/adbdbfb6831a8945f28e3fc9270cf3bb/bovabuvekefirolulope.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/pujafezamagezadesupovi.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/35657892872.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/2e4f64614b346360d075a1ded48bd9f8/26395257157.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/vitanosifilojexokanuwimag.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/69761424512.pdfIn PDF document text
    • http://northcity.rs/slike/files/23498336021.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/55006855826.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/22442798686.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210904180901260687uoigc.pdfIn PDF document text
    • https://combrooncom.com/contents/files/51490328464.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/99434191820.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/54775336356.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/jts4nouau0st5825f451g1pnct/52842231505.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130404328011---fajiwolafopitimoxuzex.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130db7d2c706---29986389593.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/88471997246.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/dowufitifeg.pdfIn PDF document text
    • https://aromamarketing.md/img/files/30597533460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=factory+simulator+codesPDF link annotation
    • 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_off0000dd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD05 10620 bytes
SHA-256: 1fcd75261152e19121a2cd0a1839fef02996112b15a5fcbc3604ebc2c552b300
font_01_sfnt_off0000f55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 18192 bytes
SHA-256: 544a82a4f69d580957ee3fd668b31ebac3816bd56c4515649f710bd37a79fa7f
font_02_sfnt_off000124b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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