Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a60f6470402ad5a…

MALICIOUS

PDF

86.2 KB Created: 2021-08-19 07:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a5ab3035527fc8b802b345a3f66c907 SHA-1: 5d0e9a6728c25b0b2bf50449349b80118e134410 SHA-256: 4a60f6470402ad5a1257b21e36a70919b5b264bc85fe287d90f204751c3fdf7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pistant.ru/uplcv?utm_term=recetas+para+hacer+cerveza+artesanal+pdf PDF link annotation
    • http://magogaralbamoble.com/galeria/files/sijozos.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096cc20ef58b---67443151975.pdfIn PDF document text
    • http://aqcons.vn/upload/files/sarivelafin.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/timim.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607041fd956c9---gamawexererumofopekupiju.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/pupiliwero.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021081600370073499.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/24032047699.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a612d812232---fikedamilawininuz.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d41a5ae95---5971483613.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/42391853359.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/4516294707.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/bojuteterazerekakufowu.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e28daa52c---nemelinodarexofil.pdfIn PDF document text
    • http://fittbikese.hu/files/file/nezawavufejixi.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/sqbdielkeqhbfcsdgjpjrpqbb7/49920351811.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/9549a78c2274c434df42f3c0b4706294/55398348034.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/juwasirasokowituvadubomaj.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116696726dfc---mutaxizijopepapetixa.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/71111570273.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/62f63c830b0afad769d4b0f9a0e4bc84/sunokurozazixe.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/257e7e245f3c1544e272db73fb6304ad/34275534817.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094379f87362---40970364522.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_off0000ebb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 10676 bytes
SHA-256: 169a051c48515530627071eae8fc2d7a7b8ffd01d3c65d43812a32da8e502633
font_01_sfnt_off0001042e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042E 18012 bytes
SHA-256: cfd146e27954a0b5b1bad43842e9bed149687162f092b72a047428ff9fce84e1
font_02_sfnt_off000130db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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