Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e92142ad898c2be…

MALICIOUS

PDF

76.5 KB Created: 2021-09-12 22:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e700c18f68467ebc9fbecfeaa5844303 SHA-1: d1b9e211caf84748135820544a8d134099a9c6da SHA-256: 3e92142ad898c2bec2f1a216474d5482c04d25035c48a119ee46a96ab1ad105c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to external PDF files, many hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://mimpishiosatu.com/contents/files/sujefu.pdf In PDF document text
    • http://jikaramen.com/uploads/files/89266314789.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7ff246217---jefozorajev.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/48677201285.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/68418309994.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202195187307593.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a519da4b9e---pisefukatija.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/89547977370.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/8519678851.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c302ec768c---9755780468.pdfIn PDF document text
    • https://tl-systems.hu/files/files/jekanegipumimafupamamisip.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/tuxobexagobefotutudefu.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/54883339587.pdfIn PDF document text
    • http://bienbao.net/uploads/files/tenutibamix.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/87898460467.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/99245172339.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/4984022182.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/dorozediliv.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210903055534_fmvlg6.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613963291ec65---18749469214.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/gutitabubu.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/48784662160.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/d032af9819aae2c248916aaeaed9e590/45850077897.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/wanusopefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=qdot+latest+song+2020PDF 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_off0000c513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC513 18324 bytes
SHA-256: 6c83b2ce4c8e9390338e359cfe3bd4499bd25946d40b74e8252b66fea5b1ffef
font_01_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 10532 bytes
SHA-256: a8806e5d293e66c62858a3bbaad0457100482412b76f42c4f7f8b98930fc70c4
font_02_sfnt_off00010c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1