Malicious PDF — malware analysis report

Static analysis result for SHA-256 a770c6c2524e2e63…

MALICIOUS

PDF

85.5 KB Created: 2021-09-24 01:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac3d9dfdb8f2777503e7934a04e3b84d SHA-1: ca10b3759f90f82b473f42c38b2046ce2cae352e SHA-256: a770c6c2524e2e6377f409ed7dc21f1c8183b17afedd89e4026859a2ebea1a62
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or link farms on disposable hosting. The presence of a callback lure suggests the document is designed to trick users into initiating contact, likely for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crysiq.ru/uplcv?utm_term=pc+live+wallpaper+4k+download PDF link annotation
    • https://excore.hu/ckfinder/userfiles/files/35778899396.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/38695185678.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/sozovuzanet.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614364bbe8296---63294600627.pdfIn PDF document text
    • http://zgic.ru/!upload/files/duboxilipefalupajezusure.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/35721406620.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/kezetirudiboloreg.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/gebixenigifipiko.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/fajiludower.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/53150518814.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/81046002650.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/betotelojizekosis.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/45989283311.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/41997731295.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109120820138014.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/172440432461383606d85a5.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613673119174d---86786289080.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/35129803770.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/kopiwup.pdfIn PDF document text
    • https://izr.fr/files/27836605038.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/kogoxuwajujibinudemupu.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139851c71b4b---33520313948.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/patilupefes.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/pefadimode.pdfIn PDF document text
    • http://chongros.com/userData/board/file/57391646509.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/6509500271.pdfIn PDF document text
    • 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_off0000e65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65B 18704 bytes
SHA-256: b59151bbf6e5e07bc3f9186b290cb84f727342e63fae4db911ac314100b03620
font_01_sfnt_off000117ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13005 10564 bytes
SHA-256: 359fa519784fc7ff4d6d957980de60e19a458cddacacc06d1852e72fb59ddcb1

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