Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef944f9822a9df7c…

MALICIOUS

PDF

97.4 KB Created: 2021-07-18 00:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d972a35f646d0469fd4d2d3923abec6c SHA-1: b9ef7067c682178604c6924e8a91ca102c7ef7c7 SHA-256: ef944f9822a9df7c38907edc83333ca45825e532f9e10ff4376637d33ecdf575
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites. These links likely serve to redirect users to phishing pages or download further malicious payloads, aligning with common phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/fa5e38003361652c880e46cde18950cc/55601732503.pdf In PDF document text
    • http://studioambienteterritorio.it/userfiles/files/rimukuwexulanepafa.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/82330430150.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/77641321596.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d44119eea3ee7cf73cc67182adbc3f47/36333968907.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc04ddaf3e---73739277970.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/c9b781dc01e5c97553a9472c5f334920/fuwibuvefoteku.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/a1e3931a40cfdd922a890fa7a9e3be76/lobetaxukumamenogasenet.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/d7027693f3815af9e27c8714c3290353/sazifogudufegededulirav.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6f2237184---83753135015.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1625621255.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/katofebiwovovugezixanabil.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c48dc59a879e29822075c21f1a2d9cb7/nufuditi.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a272db6b8b2---getunokubanojetibavo.pdfIn PDF document text
    • http://esistore.de/userfiles/file/75574776694.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/13632751638.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/jovubojakikisi.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c5e73d4dc---xizovoxudejewejokebovuj.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/3e9f618311b91f7843f1747a92cdb058/kesegakugabipoxuwoxas.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c34c0f36788c2a4f2dd8da6f706d45a0/87957193438.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/3907704251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+american+puritansPDF 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_off00011a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6F 17144 bytes
SHA-256: 114d28fbf38afb8d7f5d68813c9b966704c042a13951b96a791e1663d313a58e
font_01_sfnt_off0001474a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474A 10536 bytes
SHA-256: a680738b1aaf77829eac4b5d43141389175e4838d6fa14f076cb790b28857035
font_02_sfnt_off00015f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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