Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d4e348cdc44d8c…

MALICIOUS

PDF

86.8 KB Created: 2021-09-06 13:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b639ac5cfd211c0659c0c2e6f7be452b SHA-1: 93032ea391e3997f86c72c528bbd2d65af87d963 SHA-256: 27d4e348cdc44d8c18b8c652368b20d269d28786655add21170bcbe0d0418f17
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://medvor.ru/uplcv?utm_term=wansview+wireless+ip+camera+manual PDF link annotation
    • http://capmar.eu/userfiles/file/kiwogunikufa.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fde75f022---10914761326.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/84131656305.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160721a15ed4a1---sovegiki.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/27906846895.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b419728bd36---kesewomomegim.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ae24e0b0d---91636472546.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/febadovekoxadu.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/vusekupo.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/47013974144.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/2289918813.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/levalazenal.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f8bad55fb4---jexuwugodesap.pdfIn PDF document text
    • https://o-dance.com/upload/files/mowulafibisija.pdfIn PDF document text
    • https://icbacademy.com/upload/files/xunupokud.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f398210c9c0---73066212509.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/65892737806.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/29627071957.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f51cba9f9---6969577565.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/27261540894.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/34618184935.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/dpf1k3fi02lm8qjo69gaj6lu36/27267155999.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_off0000ec83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC83 18588 bytes
SHA-256: 2904035a2c6e7095747505754ec510e3fdba7208edb45639532cdf4fafa0a386
font_01_sfnt_off00011d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2C 10564 bytes
SHA-256: 5bbcafeaeeafc29a8533061f1e4430c2a0646aa6c07716b9cc7386f281a5fc95
font_02_sfnt_off0001354e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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