Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e685402dfceb596…

MALICIOUS

PDF

74.7 KB Created: 2021-08-14 02:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5654ca3227c2d02c807d2f953f25bcf4 SHA-1: 0ecbaa0e6883deef342e8eb1b7514c23e1d4ae19 SHA-256: 5e685402dfceb596710fe000d9d3b778680dcf887babb66724a818ac9f9c86c0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous external URIs, with several pointing to compromised CMS uploads and disposable hosting. The document body is unreadable, suggesting it primarily serves as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://activepymes.com/pub/file/64822452352.pdf In PDF document text
    • http://global-leasing-management.com/uf/file/pifoken.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/bebeverokib.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/v3g6dbur1t2pmm0tojirld98fc/sitadug.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160e5c0a3cb7aa---43976217454.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607427a05a4c2---tarewasi.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/vininadoweke.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/31388545718.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/61644532067.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/85be0ed898876e863c6aa13c41d3e961/34896208055.pdfIn PDF document text
    • https://majubesar.com/contents//files/38654249074.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/46286c8fdb58477fcd56ec2cd1949314/ruvaxepigepolin.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/h0nbvm89nvee5phtt81a5ggav1/31916330814.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/1hlfef7ogocaqvvpljd0l2hps2/9673438745.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083a5d360596---20750577114.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/72916820616.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/e82d1f77bdd6fc5f11666fe7d6e90e14/67522147685.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707b84e0e8a---vevuredofetego.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/nezujelupolekiva.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/43885276544.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/82583637911.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/74693484807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=bir+s%C4%B1rp+filmi+izle+t%C3%BCrk%C3%A7e+dublaj+hdPDF link annotation
    • 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_off0000bda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B8 11548 bytes
SHA-256: 5d12114ee6a343ec6898a31c7bdf1e785366c731a0e42b7c3c5ef14023c7ac0b
font_02_sfnt_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 17096 bytes
SHA-256: 0bf7aa965403aefdad2cd0e198e98138a775ef44731e26888baeab88295e1863

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