Malicious PDF — malware analysis report

Static analysis result for SHA-256 afce71ef7f039efa…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 13:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35f64f8cc42cb83c5853366df1845a2a SHA-1: 2e71424f6b3bb185055a0d18145467ee2dd485b8 SHA-256: afce71ef7f039efa18807210695686db3a2a5750255471bbb16962226ebcbb5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics indicate that this PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd38563065---pipawe.pdf In PDF document text
    • http://astorandblack.net/emailer/userfiles/file/donelepaxafamuw.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/pumuditenur.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109060717318418.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161363e81bb50d---90058524030.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/18740204495.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/26490985952.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/8778261916.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/joletuzekuwerowanojub.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/jenadejaxitipovojatilaw.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/84223836721.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/47769540840.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14694008463.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134e7e49de2a---92715648276.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/kasarovafevuxajuxu.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/fce5669382608e8bff9e46f11a86afbf/71400590437.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210903_79E2E81CEADF12AC.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/87267221988.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/dojezew.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/3235a9a9a59d0262ebd68a50c6785b5f/zolatu.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/nimemiputaxizise.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2ef1a0d0827c79f458306d2b9ecf42b3/91624080525.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/74104548921.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/usigutilojilelemarimad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=battery+drain+after+android+updatePDF 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_off0000d8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DB 17580 bytes
SHA-256: 91137a42c670984e9d563065ed0c7ae1992ef0d112efbfa38fc7a14ece8a6c3c
font_01_sfnt_off000106a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB9 10544 bytes
SHA-256: 397bc255464601af5e30238f0dd41a1642608bbf840b25fda9588dac1876d3ab

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