Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc4c7bf4d514eef…

MALICIOUS

PDF

86.0 KB Created: 2021-09-14 04:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d30ae46f7ebd94beb1ed6d3da8f50f6 SHA-1: 2fd2d904026c5661da358de0ed50ce783433d122 SHA-256: 5dc4c7bf4d514eefba81072890c6d96d404c65a0150dc968889a88dee91e995c
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 links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://starinviter.com/ckimagefiles/rinizijaguzaxekipapiso.pdf In PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///25832277819.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/33171529258.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613841dab525a---buzuxodimokapojenunufu.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/fidemizetubinawatosovav.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/vulolixi.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/burunonagidali.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/dupokoputu.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090807200773499.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6a2dc9943---99746225530.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/60509416495.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135ec39482f7---85461486029.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631581513.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/fomivabat.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/012038459417.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210912_B9813414E20D1AF7.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/84721051858.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/46589108524.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/kavuzugumoz.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021090111540326280.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/78001677384.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/tosodoburexinawikugi.pdfIn PDF document text
    • http://101balkon.ru/upload/files/55977839146.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/57333158348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=house+of+flying+daggers+full+movie+freePDF 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_off0000eaac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAC 10872 bytes
SHA-256: d833cd1a33d905cefeaef38920346c68a746eef5ac8184023e1c1d6ebc4aa2d4
font_01_sfnt_off0001038e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038E 18044 bytes
SHA-256: e9d9ea22f78840a52be863f8328eba590b7f70bfb5d52a4e9d5a7e2a18ea081c
font_02_sfnt_off0001320d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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