Malicious PDF — malware analysis report

Static analysis result for SHA-256 943242a9759509e3…

MALICIOUS

PDF

90.2 KB Created: 2021-09-13 15:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1617b8d927d95bf8f3975ca5c1892cd SHA-1: 039fb1cb45a4649958fe8fb74215d0ecdb1852e4 SHA-256: 943242a9759509e36fdfa3d5bd918ffac259cc2cde66515a039ef8cbec659caf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://ajivikafinance.com/userfiles/file/jefinuzotelijisexuwu.pdf In PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/66077443010.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/xunetapujerejanigirusina.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/89839221684.pdfIn PDF document text
    • http://scpt.it/userfiles/files/24798164422.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/37316962359.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/jewajefafiwedukedobevekir.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/tirubimomekarikilo.pdfIn PDF document text
    • http://lex.tj/img/file/38222773660.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a5a84ca773805d1209ebbdce52926a6e/11403143302.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/162414053361358063520ff.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/pujobi.pdfIn PDF document text
    • http://haai.org/upload/file/37999567045.pdfIn PDF document text
    • http://scsychem.com/upload/files/41388952264.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/78993114198.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/87056461656.pdfIn PDF document text
    • http://irths.com/upload_files/files/75924278957.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/furixebojuweviluzata.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0e73ef26---raxexas.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/19051b5e4829898d3499291dfd302277/zevezifaz.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/jumedix.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/13129110391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=best+phones+under+30k+in+kenya+2019PDF 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_off0000f85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85B 18116 bytes
SHA-256: c81aa377f9a82d37e130dce5f91c43a69f2ce915d3adfbad57472ab568de9e73
font_01_sfnt_off000127d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D0 11436 bytes
SHA-256: e373968104fc08f31d94793d3b61c3538059b2a3097c9619b39e2dc1131b514f
font_02_sfnt_off000142ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1