Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad6ee5618a3f4c8…

MALICIOUS

PDF

84.4 KB Created: 2021-09-10 23:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f8a19a75f3452b155bd203a7d8e7167 SHA-1: d8d1a0d2a10109aa87fed5e2ff2b96dabc71f30e SHA-256: 7ad6ee5618a3f4c8b222818116681f16a4e21f677596ea6b283d210d77e6bde6
216 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, including a link farm hosted on compromised CMS uploads and a callback phishing pretext. The presence of a 'Password-protected archive handoff' heuristic strongly suggests the document is intended to trick the user into downloading an encrypted payload. While no scripts were directly extracted, the overall structure and heuristics point towards a malicious intent to deliver a secondary stage, likely through a password-protected archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://asirius.su/wp-content/plugins/super-forms/uploads/php/files/7adda1eed08691c88507ac4b80a4a34a/xugijepafebasofetekoz.pdf In PDF document text
    • http://parfumerieindex.nl/images/uploads/nezunebivunozazobubel.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161315b6572557---786479277.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/81161848689.pdfIn PDF document text
    • http://1careglobal.com/upload/files/gugatofu.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/31236194054.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/walediv.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090111343470.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/92616643795.pdfIn PDF document text
    • http://agro-partner.com/Image/files/sajidagovebiberijadi.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c30b05694---21050555718.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/fanitijetegoranu.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/97345087424.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/bomuzavibafizekidu.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/sosanu.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/xitositatixalolalavapopeb.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/55072687701.pdfIn PDF document text
    • http://medrea.ru/upload/files/dejegejubezarijadeko.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/didevaxisukimavepupolobop.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/zomulotebudolok.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/85368717786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+delete+cookies+from+your+phonePDF 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_off0000e1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B4 18648 bytes
SHA-256: f77cb48c0d127f351fbb8589ef44c66c622f32e940aebb559358159b61afe36f
font_01_sfnt_off000111e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FC 11104 bytes
SHA-256: b0c11267d3ec1aa94ada40a520863fe141fc9a5f58c20fc3f4bd94686db34ee8

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