Malicious PDF — malware analysis report

Static analysis result for SHA-256 84cfec42e4ee188e…

MALICIOUS

PDF

85.6 KB Created: 2021-08-20 02:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b672d054ee2fdfdac92bf20e65bfcd28 SHA-1: 5e4a46d5e682e3a29e74f42c5dd37c960a29da14 SHA-256: 84cfec42e4ee188e689a6306c9b53afed49c91efda4cc90ed3047ad1bc099cd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or malware distribution. No scripts were extracted, but the PDF structure itself is used to host a link farm.

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://philabc.ru/uplcv?utm_term=fabric+for+fashion+the+swatch+book+pdf+free+download PDF link annotation
    • https://unosms.us/userfiles/file/fekoxawitases.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f85da33294---nigaraleturopedegu.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cda798255---zexatemowojo.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/wiwovimor.pdfIn PDF document text
    • http://arslanemlak.come/file/gufavefajoxisisaxoxumi.pdfIn PDF document text
    • http://gardatrans.com/content/Files/gafugiborupexumukiped.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/44c1947a0d6a4752e449d5b8a3fe17c0/topefadomenenum.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3a1e7bc1b---zoketujevibites.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/507448e4c32d160bf5ec43293b418914/ruvutoratizemaxupubi.pdfIn PDF document text
    • http://wenxuezj.com/images/File/kudibexipunovoleraxabugo.pdfIn PDF document text
    • http://apsons.eu/files/file/78410568215.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/bb34e50adf227c8377874045f7ca18b1/kuvixajofuliziziramotumed.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/jekuset.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/59428335016.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/nq08p3ri6k43tmh6jehghgd1uf/xurevujuwom.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae34ced470---26401783725.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/maxerexirutilusujizipozal.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/91574203142.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/16224524301.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/75241336697.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/vebedujekowum.pdfIn PDF document text
    • https://mfdesign.hu/files/file/38235387774.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/79720244519.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/93354651441.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_off0000ea33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA33 11012 bytes
SHA-256: caa439c12d0a044f76f9e133188effa9082239789fc70bb82b5fbcfa191aa177
font_01_sfnt_off00010399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 16596 bytes
SHA-256: d0bfd60f0fac98c7b4fc1c8980a933de056944ace6151fa045784f63962aefad
font_02_sfnt_off00012eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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