Malicious PDF — malware analysis report

Static analysis result for SHA-256 397daf092b795473…

MALICIOUS

PDF

72.9 KB Created: 2021-10-04 04:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23ab88750a5d10c9a6a101307d9ef4be SHA-1: fb95e620a9cd132422c3a3f146a116868d8335ea SHA-256: 397daf092b795473773b53ee7f9df9b33f03ebe94c19d5446707dcbf6fa22105
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://wastran.ru/uplcv?utm_term=what+did+god+do+on+the+last+day
    • http://hiroshima-teishaku.com/userfiles/file/90006845464.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139b6cb93e63---88506622720.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/v3b7otk8em19id9iosve4e88i6/jaganetudegawanukaru.pdf
    • http://kammatrans.com/userfiles/files/xuvuwojadazenalibo.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2fd097e2d---22034711403.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/912cf2610a7b5f843c6c0d2fdd3621aa/sufow.pdf
    • http://hugslock.com/app/webroot/img/files/48910727378.pdf
    • http://140.121.161.111/ckfinder/userfiles/files/wobig.pdf
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/devesunekuje.pdf
    • http://moscowfashion.net/content/xuploadimages/file/66098978087.pdf
    • https://www.hkha.org/ckfinder/userfiles/files/69381542032.pdf
    • https://eniedu.com/data/file/20210927052128.pdf
    • http://zap-interactive.com/uploads/files/jaxilepojexe.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/dobujuvupegogomiju.pdf
    • http://jr-bang.com/uploadfiles/20210903061320.pdf
    • http://atreve.eu/ubezpiecz/obrazy/file/57443814901.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161566aba53e59---58703839192.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613d320ce380a---bapopasetoxumaxafuba.pdf
    • https://cedd.saglik-network.org/uploads/file/muxewurimutatonepudero.pdf
    • https://altaitur.com/ckfinder/userfiles/files/57082097542.pdf
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/pawad.pdf
    • http://www.stemcellhairclinic.com/files/files/17836702059.pdf
    • http://gpkoaee.ru/ckfinder/userfiles/files/61420692715.pdf
    • https://1tlstar.com/storage/uploads/files/67721958857.pdf
    • https://12shio2.com/contents/files/97449571754.pdf
    • http://fohow77.ru/upload/file/50653298960.pdf
    • 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_off0000b9a1.bin
065cbefd2159d989e8ba03ea78c4d4790dc7a437c5204905e0de66dd2f1a9628
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A1 17296 bytes
font_01_sfnt_off0000e5f0.bin
05b79394aada163690c5cae28b9fc0685ae8e017d19d38e741c72dba5bbeb75a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F0 10532 bytes
font_02_sfnt_off0000fdb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB3 16792 bytes