Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5874ecf4db7c54a…

MALICIOUS

PDF

87.2 KB Created: 2021-09-20 11:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0fd1bd6eaf9ac0fd63c35b4ab20082f7 SHA-1: 75ab3fbf2738af2ccf6982b7b1b2b868bc7659c5 SHA-256: d5874ecf4db7c54a15c472da57556a78c645ecf5f7a2e1564ba94893d7ce52ae
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. Heuristics suggest this is a link farm on disposable hosting and potentially points to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://garglob.ru/uplcv?utm_term=best+smartphones+brands+in+the+world PDF link annotation
    • https://condominiovillage.com/userfiles/file/wisosanexufimos.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/xupatirebam.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/13379963326.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/38443635535.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/bosamekuwenerobop.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/45953462297.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/70533566072.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210919_200515.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/gofajujazakumusorovuwux.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e2e124bf060f82bea436fc6fdf45d9f2/12931958027.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421a5585674---vupulobepur.pdfIn PDF document text
    • http://rococosofa.com/files/files/6557710231.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/87338763127.pdfIn PDF document text
    • http://deauville.ru/files/file/xijevedokijatoworo.pdfIn PDF document text
    • http://alvitraders.com/files/sojoruwif.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/pazizulete.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/zifibexibezitu.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/46579906290.pdfIn PDF document text
    • https://777mto.info/contents/files/29133223413.pdfIn PDF document text
    • https://sentralperdana.com/file/pejinitukavevovakinudem.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/pibabotuximo.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/58717973743.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/90367822905.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e464182c9---76397974162.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/maxatat.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/96f4cb128023bdf510d64fd1dbd0d821/bedew.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_off0000ec5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 18936 bytes
SHA-256: 7f8e8311de0cd616338f723d03f9814b018d31692e9af40b964406f6ca5f5324
font_02_sfnt_off0001359e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359E 10936 bytes
SHA-256: 6e25ce66862e62758bc92a8b8d361aaf33cd483a2abf3a41b3733838b2a532f1

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