Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a24b7a53e7f8e2…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 09:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4519fff07e1ed0d32e0c6a67aa03e553 SHA-1: aa9b3da616c0c36ce96f031484a132c32cc8add0 SHA-256: b5a24b7a53e7f8e2a8891ef433ea46d374ee148443216915c475d2e4cd19b761
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous URLs were extracted, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs are consistent with a spearphishing attachment designed to redirect users to malicious content.

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=helicopter+fighting+game+download+apk PDF link annotation
    • https://oklogistic.lv/upload/file/resezanigasilogun.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/529cc265b56ece17bf668741db5d7816/90085627333.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/5174746019.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/86178902495.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210920_13E04E68BE8147FA.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/lazabetuweritam.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/63418265410.pdfIn PDF document text
    • http://voijin.com/userfiles/files/jilufubumakowabuke.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/29890631150.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/xizerumiminikirefanip.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613791e4d7e2e---dibipiri.pdfIn PDF document text
    • http://bubb.cn/up_file/file/mabajaleredebepezotalakog.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/40777010498.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/rixakovimuzimedinajew.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/fu4j516cguncim1kl37kt48dl4/fuvifajinexu.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/tuvenitorafulivojaxizemi.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/kanavisabenezonajelonufow.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/budujojimaliw.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/27893010194.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/suzogi.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/54644684321.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/52622757148.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210916_680B25575C91FBC7.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/xewopavatuw.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109160922002437.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_off0000b33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33F 15168 bytes
SHA-256: 1bda0c637ece63c0913578b0f31a338105874df0db9e8efb25b210c451de1df6
font_01_sfnt_off0000d938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14F 11068 bytes
SHA-256: 6788c25e8f94c58baf6417058f145bdc2d7b046bbf1d3ab758b376450bcc3fc5

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