Malicious PDF — malware analysis report

Static analysis result for SHA-256 9846869a16d0621b…

MALICIOUS

PDF

79.4 KB Created: 2021-09-03 08:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9a73c253e15e4f3e727c065dc967c275 SHA-1: 3b751fc5abb3cdcd0e2af6d075173878b288dbb5 SHA-256: 9846869a16d0621bda280ff9995fd7abcb9bc4990356697e1ff37f653dea4bbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure, often initiated via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/tt1g3aoehdmpsloldj4i9iug9h/51325054202.pdf In PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/a371ff7870f35a4aef60c1ee5f0c2963/61657933625.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/4han9a23apegmjckd762e5skl2/pezuvomimodisizedip.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/8ab8su9ulrbaq8239el2rc161c/94128657168.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9d628e49c---61546666804.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/dabuse.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/23cnpr4h2d24c9gmmp4hhpaqn6/dusexipapidogakebalefe.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fdb323d75---faxaweravofemuzetuzolav.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/a1ba83b38d15a9e8c339b43c82f15d8d/gusalogowizilelilakebom.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210622_5D549B18F0264D83.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/75959494734.pdfIn PDF document text
    • https://htchninc.com/d/files/69372529927.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086ef2b32b6d---45628862258.pdfIn PDF document text
    • https://susta.vn/userfiles/file/64448928149.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/32803737714.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/22213433878.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/46969960910.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/5581141519.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/44681063199.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/41217692766.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6c3de5cbf298adb711361ffc3369367c/76377604404.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/pepadazerexibosipawe.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a9f174709---60181433609.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091718042cdc---vefazubilujabedosujo.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/28769861110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=psychology+10th+edition+myers+pdfPDF 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_off0000d076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD076 17732 bytes
SHA-256: 0dde2370795f32cc9908b7372f6146206fc1002c923d3f3d3ecbbcff29d22bb9
font_01_sfnt_off0000fe15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 11192 bytes
SHA-256: f236879c8db46191be9be6a8758686703beee8f18c569b8a99841bb8a8af72b2
font_02_sfnt_off000117f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1