Malicious PDF — malware analysis report

Static analysis result for SHA-256 684ae46fa40680c3…

MALICIOUS

PDF

77.7 KB Created: 2021-09-19 15:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a8d07be0ce118878f4ef378c4e42730 SHA-1: 91b2bd4f0a1c2ea7499b1997ca90c12d69e55d92 SHA-256: 684ae46fa40680c362a0105c8db3453e04ecd7a6a2fd129073e91d14136aca27
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file is identified as malicious by ClamAV and an ML classifier, and heuristics indicate it's a lure for remote support tools and a link farm. The document body is heavily obfuscated, but the presence of remote support lures and callback phishing indicators suggests a social engineering attack. The embedded URLs point to various PDF files, likely part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://henzefashion.com/userfiles/file/rulinadutajibufokuxiru.pdf In PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/35223503449.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/8530008773.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/zanojososetefupodiriguve.pdfIn PDF document text
    • https://clubon.top/uploads/files/perosifuse.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/zeduvesodimek.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419de15beff---42390177012.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/lejutajo.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/11697955947.pdfIn PDF document text
    • https://kawanmto.org/contents/files/monizafagusovabaduzalaxi.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/lovito.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/jufapujomonoxasugazuj.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/68037479644.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/wegeri.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/8944874653.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/1c79bdf7aa7e4b708c11c5f2af0706a2/misubos.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ef0d9d7c4cf4d89239d97b7e3124be37/45343915114.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/74269281976.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/woxesokirav.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/datekakavox.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/dunokabufe.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/3dc4a4645f0ccab79d021bd7771cb00a/81542830148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=remote+vnc+server+androidPDF 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_off0000c638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC638 19108 bytes
SHA-256: bf5e2a995ef0215c7c2f522af4f4c70c98c8897faf94b1562e45c53954a10fd8
font_01_sfnt_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 10596 bytes
SHA-256: 4f531ca8448cde12574a71cf3727493c81e5c12e08122cef10b4bc4bb12e5af7
font_02_sfnt_off000110d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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