Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1caeee1aee35f3b…

MALICIOUS

PDF

89.0 KB Created: 2021-08-24 16:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b80b215a068dd0f6c98d722c2752f052 SHA-1: 26d37e8dabeaca74c6ec3c49bd0f877af4809735 SHA-256: e1caeee1aee35f3ba23d7b196c35ec5e1d70ab7571052190493d576ebd5c91f0
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users to phishing or malware distribution sites. The presence of multiple PDF-specific heuristics related to URI and link farms supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=fish+falling+from+sky+during+rain PDF link annotation
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bee30d3b416---wabudid.pdfIn PDF document text
    • https://w4house.eu/file/revutetogoxide.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/toteputivomezos.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gpcjp82gk0pgbr89cgkh898rs1/417939242.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/fadozitedekadutu.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/mirawisugom.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/36855901873.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b24ea11319---wopemizogowibolevalurobu.pdfIn PDF document text
    • http://lucann.com/Upload/file/95153197061.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/0krem5fq9ov1ratairt17bc8s6/mosavudodo.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/70417433075.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/44139089205.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/85267922945.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-30/20210730020107218208.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efb8744a02---96601366975.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/13474276853.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/75478257979.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/30740765362.pdfIn PDF document text
    • http://onlinevay.com/upload/files/78892638999.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cff4328b748---forewuji.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont//file/pijesawoxurorugudona.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210508181149_580003432.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/vudizoxojoluz.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b16690775df---93080623839.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_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 18176 bytes
SHA-256: 7025488879888c6ee127feaf9abdeb4d5646ce7417277344478412b0886096f8
font_01_sfnt_off00012370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12370 10856 bytes
SHA-256: 4c8353e290b2ab9f3b5195c55a1f58dd98d732cb4900372c198f41843b479f16
font_02_sfnt_off00013bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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