Malicious PDF — malware analysis report

Static analysis result for SHA-256 5246f78f8a5cdc37…

MALICIOUS

PDF

87.8 KB Created: 2021-09-20 05:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e884ec2446fe9f4689a44845e21e5df1 SHA-1: 50dc1a8be0066a2a4efab8594e4c95f75ef9cf5c SHA-256: 5246f78f8a5cdc37ece660e93077b1f2f22446de482cf5068aede4e11aaba980
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely leveraging a PDF exploit or social engineering to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://laborke.ru/uplcv?utm_term=snow+bros+game+download+apk PDF link annotation
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/54851174901.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3fca68f593666858f83636d81860ff48/jijawusudejojetomafulevi.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396d1300c37---pefezu.pdfIn PDF document text
    • http://riph.pl/userfiles/file/legejabaja.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/10575207447.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/2994574392.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d14234d14---xusowowesuvogoxipa.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/82394378959.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144ce0466889---rogutej.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/45678148816.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/zomoxadoxagi.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/daniw.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/27606820442.pdfIn PDF document text
    • http://greenbelt.abwingsmd.com/uploads/files/29893011220.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/sulideput.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/85383670035.pdfIn PDF document text
    • http://htygroup.com/upload/files/11570877838.pdfIn PDF document text
    • http://cecev.com/stockages/files/86263942667.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/14964401241.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/foranefipebowegu.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/babosiviketedukitu.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/43953022111.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd39745503---dadodewemupotolul.pdfIn PDF document text
    • http://logicamail.it/draft/media/71894728940.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/11602238645.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/lujivafuxebegi.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/39270625228.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_off0000e9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D6 21088 bytes
SHA-256: f666eef0695274432e1f168ed83052a13d86e828db5789c3f620dcd3dc2c590b
font_01_sfnt_off0001208c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A3 10936 bytes
SHA-256: bf18bfbdef608e9ee9c6ec932eafecd59e4a22ca3bac601eb1c9cf29bfeaae26

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