Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d126a635aa0b6e…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 12:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21297aec415b9132efaf21ebf749ac1a SHA-1: 7da6b52d7724874d62885044b1151a81843e1e77 SHA-256: f6d126a635aa0b6e52f61018b23bbb3a0519d62dae214022d4406384d30ef679
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable domains. This behavior is characteristic of a link farm used to distribute phishing content or redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=tremplin+ind%C3%A9pendant+onem+pdf PDF link annotation
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/79772916500.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a33f4b86b---71732811660.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcafa85b10a---domerugipelelafumom.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/kajejefifuwagokadafanopij.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b3f51bc88---lifufesubabovagem.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/86a95277b0248af649277f5c987e5b2d/68252477849.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/18195351110.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b24bdb09---24704083701.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608f39a3decf1---xitujige.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725a7eb2b5b---22858728743.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/ff1f7c3d45db3edc71022b6441bff0b7/93159088337.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/mesavej.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/f3t9p3fpvq75i5kpcf4jldgoog/malaxemojem.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dfa0bdc73---66800700735.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab956733d7---fizokisajuduzaxubikimu.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/c6e1675ecec33e6500a4f134a46784f3/pararalumukepilopitiwule.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/51958373307.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/kovodisaze.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609144a342793---75850638308.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/xotutukebijoka.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076b1c3541d5---99092763046.pdfIn PDF document text
    • http://ativn.com/upload/file/menilabaxoka.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/52986382696.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/fipuje.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072354d8af01---gepupururabesovaragafaj.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_off0000ce26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE26 10608 bytes
SHA-256: aef77b72e004f409e6896f8e1ccf4afc91974d163512f32eb0f48e661640e0ab
font_01_sfnt_off0000e602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE14 19516 bytes
SHA-256: 80fd7e02157e1632be4571b4bdebc812cd463a101016b8fc5b6751bc2f538f43