Malicious PDF — malware analysis report

Static analysis result for SHA-256 134a429feb27baca…

MALICIOUS

PDF

78.7 KB Created: 2021-09-17 16:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a35699fd9d59a6745f819a3f7ab80e2 SHA-1: 4d1528f975f4e2388731729c00a250ae63c60a7b SHA-256: 134a429feb27bacad28b41913ae77fc7b8c2e924d2657f5b8305ea99bde828f5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://sysquare.com/UserFiles/files/22049935882.pdf In PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/jakosab.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/lakitufokuv.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/72536222878.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/9712084127.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/lajuwelibefi.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161363d51cc1c7---lebur.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202108311815267268.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/54618244542.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/62795906384.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/guvivifejejetiwer.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f949674b2e---96126535199.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/32393065212.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/62111902388.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/80cf65a16aba70036cd3210b34d8855a/wemuz.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/54696599660.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/58673888469.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/92458969915.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/sepokumonesedem.pdfIn PDF document text
    • http://retailcop.ca/files/wisanux.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/72121357448.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/aaa5fb35526067f5e6e98f3410ce4ca5/23381769767.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/visudilivarelatuwik.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/raxijodirekare.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/98004297146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=kandasamys+the+wedding+onlinePDF 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_off0000cea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 10784 bytes
SHA-256: 811cf72b870840e8dbb2a2983bef2fce57ed10580bd50cf12cae245d0df41696
font_02_sfnt_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 17456 bytes
SHA-256: 3708b30c1b240acf50947c704c67079afa6402006775b7eb8e7b61f62d069892

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