Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98453635375992d…

MALICIOUS

PDF

82.0 KB Created: 2021-09-23 04:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e2da561e58fe1a59d20b94dd5557d794 SHA-1: 48fc30b0a77f6a35e6c10727dffc6a97fd39c134 SHA-256: b98453635375992d785c180d1a09da962719acb001f396e39098acf5700b1d57
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The presence of external URIs and links to potentially compromised CMS upload directories suggests the PDF is used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://hk-bbc.com/upload/file/36414230320.pdf In PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/femadoxajawuseza.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea141e28e1---28386174301.pdfPDF link annotation
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f87b346ee8---18471200425.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a2549faaeca0c999103aa4940059894b/11280077519.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/pegavavazolopaxogi.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/rerogipitiwofag.pdfIn PDF document text
    • http://bulmarconsult.com/files/wereb.pdfIn PDF document text
    • https://vigilanciaweb.cl/dinamicos/files/file/75021107059.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/50177844533.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/zaxiguzodojezuj.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/sirufekinizopogejuk.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/h3vnekioq8bmebi4t9t08huh3m/nisujitag.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/fixebep.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e035b4316f4413cfc29d1aab7b3e0ac2/lokikage.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/nuluduz.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/39009694545.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/70562306580.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/67141324809.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/pirofetatinevelu.pdfIn PDF document text
    • http://techbis.pl/files/file/40532079210.pdfIn PDF document text
    • https://zagi.hr/files/zusixulitole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=tivizen+mini+for+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_off0000d412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 21492 bytes
SHA-256: fde1a43aaf35df49235a888ffc868f43ad045fae4c3f8ae3c589a81b9882c3e2
font_02_sfnt_off00012379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12379 10292 bytes
SHA-256: 3358f768472a92303dac7d69e81c308cc8a57afef2d8813669c891710399896f

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