Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba8d143e86abded…

MALICIOUS

PDF

94.2 KB Created: 2021-07-14 07:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cac0efb2505dc0e97f4e9649cae8d3a SHA-1: 82614aadeeb22fedcbccf06e4dc62568d07af511 SHA-256: 7ba8d143e86abdedbfbe6d5d483f91074c6ee96410c8e64a1359b7dfb253f74b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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.pranabkumar.com/fckimages/file/dujesila.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/461bd34ebf6125abf12924b83efe3091/kixoviwizurexomugisutovot.pdf
    • http://www.dereformasenalicante.com/archivos/files/kilebo.pdf
    • http://skomi.ru/img/files/file/lafokikafa.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607616d9f065f---12205285111.pdf
    • http://dioceseofniranam.org/userfiles/file/mebikesamajibanojabimoto.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a90646da06---29422002643.pdf
    • https://aquafilling.com/userfiles/file/67525342949.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/7744a565abcca2441a3f981943e3c034/58344907075.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076e96dee92f---meguwiwujatotinefegopom.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b144b094909---62472690771.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb9740e198---muziladotunidufodus.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/mf7rggmn6ilni8ss123hjt5cf2/49941377562.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0989a50655b52fb5bebca7084276abf8/volorerideseval.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/0545fb71c0d6e375a6a354b66cb99434/92873685860.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/hfs7bmjmv0ah9938h9ct4r0lf6/37123396984.pdf
    • http://driver-jazda.pl/upload/file/tesexonabesabex.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/fabeleloxuxamalowikide.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/5d4fd418020c083cf485a3237e64e33d/kolet.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9049a0212---tulanepomufitejanimexe.pdf
    • https://najlepsze-w-polsce.pl/uploads/58515973884.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160af9a1cd89d1---tozatidoxipilodejexuja.pdf
    • https://idd.no/ckfinder/userfiles/files/49967338646.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/zubesetodel.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=different+types+of+mania
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014df9.bin
5436525110f8ba1ad8a1def27ac584ed97b00f1bacbd1a2f8edef472ebc0661a
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14DF9 17896 bytes
font_00_sfnt_off0000f10b.bin
3178afa6ec90a280178dc3f06ee60399845ad763bfec15b9a1a86df8043c73af
pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 10588 bytes
font_01_sfnt_off00010944.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10944 16792 bytes
font_02_sfnt_off00012156.bin
8b51b1f60a2cdfd4250e75f8996affd16617fcd499a7b28a63bb5cd5c8f6d02a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12156 17292 bytes