Malicious PDF — malware analysis report

Static analysis result for SHA-256 e366a3d4edfde51f…

MALICIOUS

PDF

71.9 KB Created: 2021-09-22 22:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7294bc146c537812445e37718e058d1c SHA-1: 96a5a3c11e7df16924af4c80aae6222277d85edc SHA-256: e366a3d4edfde51f549271b0b5f49e77eef663916710eb02c0dfe1c8256d55bd
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The presence of numerous external URIs, including those pointing to compromised CMS uploads and disposable hosting, indicates a link farm designed to redirect users to potentially harmful content. The document's structure and embedded URLs suggest an attempt to lure victims through deceptive links, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=minecraft+writing+paper PDF link annotation
    • http://files.ibiza-ferien.de/file/74813301558.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/ledejijiwuponawewewon.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ca821666c1a05cf700c76efcd5fb057b/manesadukaxidotidejozag.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/dupepedobelikisilow.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/24605914188.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/pilekazitusazodutuwamir.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/zirowirologuduwaw.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/27955360235.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/govev.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/pavezomub.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/kakina.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/18806261700.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/nokoworelakutamuvaza.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/datapadojiroxoguf.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/31888936055.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130d8c3efa82---xeritafawusukadip.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d17e64810c9752eec92419d37773b0b1/57008275695.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613caec6b16e1---99731501244.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/lilejidaga.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/povojajipu.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/juvekosisoberogovuvap.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/49761985040.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5fc3163b02ec6cad2bae2a1abc8a96ae/jixegodadaxibote.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_off0000b9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F1 10400 bytes
SHA-256: f522efc30b1bfd382f926e55b55812a52f35b7892876413c25ce2f6964155f94
font_01_sfnt_off0000d1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C1 15656 bytes
SHA-256: bc496db32ef1d6d9a52999df3c0f319b8d433ff128afb0bd5d27a712249e84fe

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