Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6e717cce87b377…

MALICIOUS

PDF

78.2 KB Created: 2021-09-14 15:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5764e9f747f0313db9990669958143d4 SHA-1: c89e2aaac62fcb138279be971808a62a7bf12766 SHA-256: 3e6e717cce87b377dd8b770f98a6b56648f9ab9adc669bd64b4c346d2ee20eff
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of link farms hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of tricking users into downloading an archive that requires a password provided separately, often to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • 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.
  • 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://infrive.ru/uplcv?utm_term=best+pdf+unlocker PDF link annotation
    • http://centronegozi.com/public/zulitotebelazavunuzud.pdfIn PDF document text
    • https://olterus.org/contents/files/9181316716.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161374e84c1a8b---72221893524.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/51357512184.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/74773044418.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/vobusogewudajigifiropan.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8e20e665737203204eabd0e1ba2a46c0/7720940077.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/32b95a0ac87056d062e542683c3128ce/kumusuxuvibudakejenon.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/75785941463.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/28498510204.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/94535229355.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/6165222979.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/49e1772492d3171fde71909367e82749/12715342962.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/tupemuzugumibajomifuz.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/xeloposufimog.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fddb1bf49a---44720938427.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/36211290981.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/15966573796.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/66878347185.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161321a8249b2b---1674718820.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/widobarizesegijaj.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/30320374280.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_off0000d055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 16500 bytes
SHA-256: 4f1786823b7e2136f8f5a744d7c64bc692270cb2a979cd39735d213e0e04f182
font_02_sfnt_off0001135e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135E 10604 bytes
SHA-256: 0d3e280fde5fdc9e72b843dec69b5181dc4cb8f8370914226a45497072f88ae4

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