Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c16d3d5a5cefde9…

MALICIOUS

PDF

86.7 KB Created: 2021-08-11 13:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a7e86e7d9810c1df148de1662aa4983b SHA-1: 33fa90c36ff03f98ce7bdd6b92e8ee41ae879672 SHA-256: 9c16d3d5a5cefde992f6c966d4c333982849e17475453bb5c294118c4aaf76cb
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both strongly indicate this PDF is malicious. Heuristics identify it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern suggests it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pomocnaukowa.net/Upload/file/nefexepibujupasinoz.pdf In PDF document text
    • https://masihpt1.com/contents//files/burili.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/38927361143.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b195bc75bfd---wuvidiberejopuj.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/kavoso.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/16489584921.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/h5f81boj8fuipph76pm736o7rv/duwibemaji.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/zolagajanilalevozos.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/9d453ee52e3fa789082fba5e9aed521a/31052711305.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/45108a191030e663e855fd23c7e9ea06/bujozenolumoreve.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/nolimurekuzi.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/8esrb50j0dc2uj1ioblct6atf8/53329074706.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/leseguwuxuzoreluju.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/91427051523.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/83190987800.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/34548435383.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210726_90811024E4424565.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/31785522598.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb376d0344---98664047543.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ngt8s3lukoddugru71tsvhelt0/gasodawakonudoperuwa.pdfIn PDF document text
    • https://lecapsuledigian.it/file/sejisuzokuge.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/78aa937ccbc80c98d7f167ca29f433db/dosisalunevametulevoroli.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/ac3d0add62595ae0c2f3da5c8523c145/sobimeginubolimisogogetop.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdf6d1028e---woros.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/11958960147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=scarlet+ibis+packet+answersPDF 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_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 10640 bytes
SHA-256: 1639c564cdabac58fb0ed41c0b76a09aa268fa18e37716f4f143ce2ee3361384
font_02_sfnt_off00011e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7E 16764 bytes
SHA-256: 17900b4894b1b7beed6da4d46a1fb4132df9e52a24a20333a387d8ea9cdc21b5

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