Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef5060038e0cfb4…

MALICIOUS

PDF

77.7 KB Created: 2021-09-03 17:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7bf166977f6dad61e3d71c97d9425fe6 SHA-1: 6b373fa57614263568868d311b728eb5c1ea2f05 SHA-256: bef5060038e0cfb4672c9fca3aa1823fe751452fdaa1ce38219712d23d20fd34
156 Risk Score

Malware Insights

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

The PDF file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to lure users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/c482ac058884838972ff336cad4d10b0/vebatuzakilupiduv.pdf In PDF document text
    • http://drivingschool-brno.eu/files/tijudixuta.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb51d7eaf4---72628625258.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210617_110123.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/gigovet.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/19781180841.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/32148abb1f00b88d22607f26466f33b1/worobupoxaledere.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cd08c86d2---wemerozibupob.pdfIn PDF document text
    • https://estoniapools.com/contents/files/jowurulalalamanavotab.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/tulunedezeruzobofagigaza.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/59401c3ec27db19c4af8368eb6f79a94/sebadozuwasorotibibuze.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/kt241839oap665k5jc7h2i5k8e/9670077743.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/52931336905.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/wafumunowiwofegu.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612cd9c2a15fa---18753390146.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/woruso.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160774082e0fed---88756071265.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/3talhhd4onkan2ln2uger8tsls/jibur.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/safumiponobeb.pdfIn PDF document text
    • http://juha.be/_files/file/jazevunubimux.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c04a1d931a0---tukunap.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/donejozerezunenazol.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/jabasifimudiko.pdfIn PDF document text
    • http://citysuji.com/ckfinder/userfiles/files/voduxazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=introduction+to+fourier+analysis+and+wavelets+pinsky+pdfPDF 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_off0000c12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12A 11020 bytes
SHA-256: 1a97cb5528246cf720582cbe542a945e180a895a3b200f3faf72cfb734e70d0c
font_01_sfnt_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 20884 bytes
SHA-256: b4aca84b7e258aa625e16891c07f846eefa58810a3b9bcabd24aac65cd1bcdee
font_02_sfnt_off00011120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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