Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68ec39e4f970000…

MALICIOUS

PDF

74.5 KB Created: 2021-09-18 20:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92967f5f18dbd66a031ec61fe114cd1c SHA-1: 5f7dbcc431446ccaf83d52c2cb9a2eed2e841995 SHA-256: d68ec39e4f970000700fa09e059ca869440b1d919324c6237f747aafdf155857
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a phishing or malware distribution lure. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as an initial vector for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://medvor.ru/uplcv?utm_term=cryptotab+pro+apk+full PDF link annotation
    • http://vitalchurchesinstitute.com/files/file/rosisa.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/mizazelup.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139060998893---nezidarabaf.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/79929794921.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/fevuza.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161373ed02258a---gozoku.pdfIn PDF document text
    • http://newworldss.com/uploads/file/lodirutositapi.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/2155053893.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/98108573230.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/zegagafuninunaxipat.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/darevawaxesezisejokopefa.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6504cd4c6---4175841351.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dizijiwogijudomewaxiz.pdfIn PDF document text
    • http://profstil.az/userfiles/file/zoxorubifizugowusofo.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/wunawelajagimatopowevopu.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/jedukoronibemufesebuxiw.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/gaxaxageraxiwafivovomav.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/giniwafufawudabelamuraguf.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/surinarabemuwaful.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/67715004077.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/46989177013.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613106e969216---sodexesamufiwitakigis.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/17135228746.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/39057653681.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090909012732.pdfIn PDF document text
    • 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_off0000bd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1E 10332 bytes
SHA-256: 5200e04f6ff985e62839ba8923415a0b67ee62bde106a714bc015f5b771f5cbd
font_01_sfnt_off0000d465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD465 17924 bytes
SHA-256: 6a84bb2416b778e40ff4f3c0c2258be628d2ffd2833907a0aa527b34f91ab8f0
font_02_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1