Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5bf1b3f618accb5…

MALICIOUS

PDF

83.0 KB Created: 2021-09-23 02:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8a03629953a7c35637cd0d0b393de772 SHA-1: f4ffa280d92e642de38edb6b9fef2e1585f6d535 SHA-256: f5bf1b3f618accb5736d48c9195e7239a2c0c7c1cbf28629e32508ccf904870d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://datajournonepal.org/files/tekaxifixato.pdf In PDF document text
    • http://ozcetinler.com/userfiles/file/bapununavugajij.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/sepepetifutivujewojep.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109030056296605.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/dogipesetodibenoranefojes.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/85025302039.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/sekawemupomumumemisapok.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/43049389841.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/jitimabojimixujuva.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/weporujemufa.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/77504449127.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/73959143605.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/18363251631.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148cc1436dc5---38538241374.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/71066152333.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/kuwiso.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/5432060006.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/nerina.pdfIn PDF document text
    • http://bamor.org/userfiles/file/puvif.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vupibajupuruzegodariw.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/57669102793.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15c07129e---fakizo.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/34118059020.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///32583751873.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145ed0fad292---kajuwevaxigilakuzivedo.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/jufalekikezikomejomaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+can+i+transfer+my+contacts+from+blackberry+to+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_off0000dd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2C 11060 bytes
SHA-256: 353f52d3a2f030547fc9c6dfc4eb760f0b102225f88dcc0f8d3a25ca5ea4c078
font_01_sfnt_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 18252 bytes
SHA-256: faf58be1ad4dde3733beebf6fb734595d6a09542fb0ab113a4f7346b42d021f5
font_02_sfnt_off0001260c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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