Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf21cf0e050df4e…

MALICIOUS

PDF

80.0 KB Created: 2021-08-31 19:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a69f5e651aa8c9bfdbf0698ad918adc8 SHA-1: ff237beb72b87bab2c8248fe6537157b19c90351 SHA-256: edf21cf0e050df4eda3787829a75f8ef94ce0682884f410580db8947eb9ff4a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs, many of which point to compromised CMS uploads, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploitation or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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=roblox+robux+account+generator PDF link annotation
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58908140660.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/gijeged.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/54520882215.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/f47b550266e440f923a69245aed82a39/bosalipateraxejogevodasa.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7df900e53---55884442599.pdfIn PDF document text
    • https://hgb.se/filer/file/bejebesamo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78b3e65be---nutidaliginewowokakujufom.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c16ee5353db---lasezanu.pdfIn PDF document text
    • https://slide-bearing.com/d/files/2825700735.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/74389590172.pdfIn PDF document text
    • http://planetamama.ru/files/file/55287571287.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3268c88b143e734ebb7bbda2c4dcca1c/vozazutitapasosuxevesabo.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcc25b26094---58552254734.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/91728998055.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160949d3b38ccd---zepisunof.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/basimedirexilinuredemozu.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/ruxix.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9db8de006---bekixelijosataperiwomadab.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/kepadatote.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e44328c7dd0---42052447222.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f79e335e6a6---bibuwuweb.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/fejuvurevuwo.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/jefujed.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_off0000d7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 16212 bytes
SHA-256: 405c709c8528b06e638906b7b53fb7aad089b31f6e69600aa1d6cb23a276e212
font_02_sfnt_off00011990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11990 10532 bytes
SHA-256: c063c3db4630e28627b7fa91499669cbfe7b91caab239f61fad53fbee7421d65

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