Malicious PDF — malware analysis report

Static analysis result for SHA-256 537cc4a6c3fd174f…

MALICIOUS

PDF

88.3 KB Created: 2021-09-06 01:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a62d9526bab6fbefaef859b9391be405 SHA-1: 887cc7f85674902869dae31db1defdf52e6b2580 SHA-256: 537cc4a6c3fd174f66ebb35e609720d3c23cfb2d6d4784ad758ae4fe15e034c2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and other potentially malicious hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm its function as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://becskeicsodajo.hu/admin/fck_upload/file/jufanawegufovarigufe.pdf In PDF document text
    • http://diysmart.net/userfiles/file/gobosobazegisib.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/5ab410ddf2f39a8982a887b63c7700c8/51729838392.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160be364fbc9d3---dusebimubemupedimupinavo.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160754d5e23456---67817884534.pdfIn PDF document text
    • https://equinox-e.com/upload/files/pewojidagosugosemajigura.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/80066477764.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/0u94ekaeau4a61mo9mghu2t6ig/23733824900.pdfIn PDF document text
    • https://fultoys.com/userfiles/fosipewug.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/60784488190.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/4188501480.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/nolupebonemuxekoxowema.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/45275154606.pdfIn PDF document text
    • http://ktcz.eu/files/files/fevudokaroweg.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/77f738a343bebfc1dbb5d738701a4213/wegofipowup.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/712a42b39bddc9768e6eac7a9ec9909a/xabevomobevefajaxumojir.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/92243482012.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/matapebugaxasimavipurum.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b639a9ccdcb---lorugilaridosinomanojeba.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210724_CD2CBFE09C4DF2EA.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/bawigakesamujijelikako.pdfIn PDF document text
    • http://onelove.cz/file/wupalibodemoso.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/xabokuvekuxizok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=embedded+software+development+tools+pdfPDF 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_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 10844 bytes
SHA-256: d8232edd8bb5f2d42f678c72542d7bc9633912075e69a21b67e5253f05d88b86
font_01_sfnt_off00010d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001251b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251B 18136 bytes
SHA-256: c06d56ea5b33beee8d772104b536e341e3a11b364b96e2e8e02a7d950795623b

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