Malicious PDF — malware analysis report

Static analysis result for SHA-256 54dd31f13f0d9da9…

MALICIOUS

PDF

75.1 KB Created: 2021-09-18 17:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc1f3baf579fd70050fe0ca8588380aa SHA-1: 17c6b9cbc1f513deb65a3bdc46ab655647438aee SHA-256: 54dd31f13f0d9da9b8f01e256e36ae448036037dab8650cd9313dadf46251003
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.marjojaspers.nl/ckfinder/userfiles/files/jugutaruk.pdf
    • http://lyshiying.com/d/files/bumesu.pdf
    • https://tttinox.com/upload/userfiles/files/70454770055.pdf
    • http://topenglish.sk/app/webroot/gallery/files/41895946987.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/b600an923nlko3cjbu5auctbd6/folimu.pdf
    • http://sport-zavora.cz/data/file/jujalumol.pdf
    • http://mebelhotel.ru/userfiles/files/94656882141.pdf
    • https://cargoservice.pl/cargoservice/userfiles/file/dulorufogibaleduzigozisu.pdf
    • https://guruvinodji.com/Userfiles/file/dokidepuxakoxeralaxiw.pdf
    • http://rigdrilling.org/userfiles/file/pakolurinupebekaziwidesu.pdf
    • http://jinshi66.com/uploadfiles/files/jigapanafivufumigilike.pdf
    • http://abbuffalowings.com/uploads/files/85886716797.pdf
    • http://aftckwt.com/uploads/file/47157971701.pdf
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/50991252666.pdf
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210916012015.pdf
    • http://grimastone.ru/files/sivevevaxeboza.pdf
    • http://becucci.it/userfiles/files/wufelagijupij.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16140cb86ca070---60385970349.pdf
    • http://madinaboys.com/easydo%20v2.00/files/uploads/pitatu.pdf
    • http://kxqcgs.com/filespath/files/20210906115614.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130cf2565be4---75697296455.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=app+skin+ff
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AC 16792 bytes
font_01_sfnt_off0000dcbe.bin
232f9172b8d1fb2c2321dcb86736f95bc566c4749041f2a1aa6a97bc44ac81c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 17356 bytes
font_02_sfnt_off000109b7.bin
95a3e390341b0997c9a44a9a56db7dea9f8f0faaef70fab1172f850420c7bc08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109B7 9764 bytes

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