Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90bc9fdd35843fc…

MALICIOUS

PDF

84.9 KB Created: 2021-08-24 13:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 07b927ea1bd127f47ef1e94a34d15b5e SHA-1: a5115dd41b786284857e2402af0c06229749f2c7 SHA-256: c90bc9fdd35843fc45c4715025647a0b6bbf31bc7a3d6b8008d36684c9fb7e70
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://philabc.ru/uplcv?utm_term=before+and+after+industrial+revolution PDF link annotation
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b9f004f0e---62437919275.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/gozafurufovabepat.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/36365412658.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/cced95c636ce46abdb69bd8c7bc16e98/39137610318.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/40825987965.pdfIn PDF document text
    • https://agatanorek.com/files/file/11175518820.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/53772514703.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/sekixusofe.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/xegulagadutudojidovalofel.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/5hldvhs3o0r8dl69u463ae5gn2/jidopokomu.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/8b1c2043fced6b7978da9112a78aa3ba/gevinagerarijareluf.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8b0aee07d---20002117594.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1d0i7a88p7qdvt66u362l6t7jq/35990020630.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/5e7923fdb5b3ac78972ba8fc05c1673f/wodixoloba.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/950ad8e28eb27c97d89603a2e60d7593/ruzumitaraxi.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/61636124738.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a223606904e---tasomesiwi.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/70820185520.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/mafeloxowutuwuxikof.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/fikitikipu.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/91709857889.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/870923f695217b279b9134e55ebbde31/29305363629.pdfIn PDF document text
    • http://mextro.de/upload/files/kasosawedomojipimoxelugis.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_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 16600 bytes
SHA-256: f0b8338c0f84dd4cfa95d64e1ea54934a16e589b2d3fda78919e88d0353382ab
font_02_sfnt_off00012cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCE 10568 bytes
SHA-256: e873ec587875b6c46aae0f726add7238c31bb29d6a0233d994e2dc189f4acbae

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