Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8e73fbf52ef7ee…

MALICIOUS

PDF

87.7 KB Created: 2021-09-06 12:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc2cc7d3989874fe86338e082252c992 SHA-1: 04224d99db2f0ffee4edfa00d667563e540a65a9 SHA-256: 9c8e73fbf52ef7ee87b7c794925b292a93d322315c975b0d3353094e80760d11
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm to direct users to potentially harmful content. The presence of multiple distinct hosts and the use of 'utm_term' parameters in URLs point towards a phishing or malware distribution campaign.

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 https://crewmak.ru/uplcv?utm_term=climate+zones+of+the+world+worksheets PDF link annotation
    • https://edubox.mn/uploads/users/0/files/39880378251.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/zemizivorufuzobinakuw.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/vodufujipow.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/46497400510.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/ln7t72fo2tkac71rpq8rboe1tp/31050708344.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/um4hanlkgus9a8uidnci9rn1su/32212620589.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/43456697992.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/judodonowukuzowovovinasi.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27e3edffd---vekiwagojomevogagajekiwuv.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc0a3c0d89---22375364373.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f80f89df8---35577774643.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202108211643331320.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/rovugodisazal.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/25243131753.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/wiwafinofukuguxulajek.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/f6dq6s3a845s5818amdpe28q4r/befaxuwog.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afaa6eb665b---68163875359.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4363581a1---18704935390.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/votuxameromebiwab.pdfIn PDF document text
    • http://i-dron.cz/data/file/84917033429.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abb65ba0444---zifewedosozugufifu.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609016aff0531---77654372780.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/51926612457.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/2u4ohrfrfr4402tr8c5g41p812/fakibudoxoralowele.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/73371222350.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_off0000f030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 18032 bytes
SHA-256: f2d32f230b245e0a13ed65d88f3375d1b80129452a8892f95cea4df99c4aed0e
font_01_sfnt_off00011f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001378d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378D 10888 bytes
SHA-256: aa004d63fc44200d1cd9ef9966185a1483d2a835c03d3f26049508c759f9f4f1

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