Malicious PDF — malware analysis report

Static analysis result for SHA-256 387747374a3c4dab…

MALICIOUS

PDF

78.6 KB Created: 2021-09-15 19:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 02d3e7c869efc00d27ed69c084b50af5 SHA-1: 7408b7af5c2836f467e4aeda0405413791788392 SHA-256: 387747374a3c4dab5c8d534cd5363182193c3067258b2edf047fc65e3034752f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The presence of embedded JavaScript suggests potential for further malicious actions, such as exploiting browser vulnerabilities or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tantos.jp/js/upload/files/mupovosekikifatofosok.pdf In PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210910_80DB74BABB87855E.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/mosaf.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/45327613425.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/47358245821.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/96966564538.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/13860478566.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/xakix.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/xodobepe.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/34943148198.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/wesaguzazedigedevewu.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/67992118082.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139ada007073---tasozabatanafamum.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/bobubaweji.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/871a2ded2e77d0defcf9c1679513e49a/28071894953.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/dopemubipunodirazaf.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/as7n9cs6ktuffetp002uljvmet/povuminuzem.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210909093308.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/jaxorodovap.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/lajobovotisaxowavifow.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/zitajovanisigabebidotit.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/malurab.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/giwutowipagoxemide.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/31627465784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=bottom+sheet+animation+androidPDF 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_off0000cdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF3 10520 bytes
SHA-256: 4eb422715dab4b5cbdd3c402049484c6525872fcab9278b16ff07e3b8977f589
font_01_sfnt_off0000e5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B9 17944 bytes
SHA-256: 06b337a2aeb8337e198d865ab3341f4ef046151688356aa824093e32b57703e0
font_02_sfnt_off00011472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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