Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a67b7c16f11e7d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 14:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c2aa3ecfad18962cc8ce9bb890f944b SHA-1: 124f4f04196f9ef27d2fadb25686a2fe15fc81a5 SHA-256: f7a67b7c16f11e7d2dd3d4ef7404e100ce70d54cb4b4edfe1cd5f8dfe445982b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/50631822406.pdf In PDF document text
    • http://chip-chup.hu/upload/file/46436579622.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/sq26fkvedq1v63548baaf7g960/28786501403.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/85408559932.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/49862348078.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/kakokusujukokafejipokepeg.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/84239568793.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/judejenatugasolobujarirun.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fde000e564---64926089219.pdfIn PDF document text
    • http://test-immo.com/file/ridipesimij.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109072301267976.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365010f2296---23508609761.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/30053723529.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/loledatawepumanok.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/samepadojopoka.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/lofemufujikejusisegana.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/toniwixa.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/72176566531.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/56752818824.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/komubusog.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/juvasudatobolegoposedudax.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/gasagutalix.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/pewuxoz.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/wuvom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=document+recovery+apkPDF 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_off0000dc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC54 10604 bytes
SHA-256: 9246d4730f3a5a2e60ed963b4e2722d3fd23a628b7659cc0dc2e51134e56e559
font_01_sfnt_off0000f497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 17928 bytes
SHA-256: 45108cb07d66b7398cb904272a37a9866e62edeca92d69c703ef0a6d3724231a
font_02_sfnt_off0001230b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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