Malicious PDF — malware analysis report

Static analysis result for SHA-256 520aeda3dd619b79…

MALICIOUS

PDF

76.6 KB Created: 2021-09-19 09:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8c44e2a15732874ab446fab8e33a330c SHA-1: afc09e22a037375f974d6407113c1b39803b0e22 SHA-256: 520aeda3dd619b792dc2d0a9d06dbe4d6f3d1fca8f8ee6f7c4d8c37b83fb1e8a
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 are part of link farms hosted on potentially compromised or disposable domains. Heuristics indicate these are likely used to direct users to malicious content, consistent with phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://synerhu.ru/uplcv?utm_term=fate+grand+order+mod+apk+english PDF link annotation
    • https://pontus-sd.eu/uploads/file/30135207773.pdfIn PDF document text
    • http://na3.it/misc/file/kesaroj.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/sorakunorel.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/mivadakodi.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/begeto.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc3ea213aa---mufenako.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/24066552460.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/64948596457.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18121c5d8---87161987182.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/53405610031.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ff3b3eda0---21539064342.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/47515026558.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/77520544498.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/zozibuvadizazofivuzire.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/25083140774.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/64680217746.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/94026472993.pdfIn PDF document text
    • https://rajakedua.com/contents/files/bubugerimeruvibu.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/83422758385.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/satidakakufupeze.pdfIn PDF document text
    • http://creationart.hu/files/file/fesigapuku.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5ee7f1a47ce325ad83ae7dda84c59443/74062900886.pdfIn PDF document text
    • https://limsurempat.com/contents/files/5633505683.pdfIn PDF document text
    • http://clerus.hu/files/file/falegunob.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_off0000bfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C0 19580 bytes
SHA-256: 435fda3e985e13f969d43ad90ac7a0fbd824e517b108cc1329bb703ed577308e
font_02_sfnt_off00010be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE3 10908 bytes
SHA-256: 53f47c5b7de00d0297c602773e7e885dca104531f7c476a98f2c9e3de971d028