Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80c5d32d6b12f2c…

MALICIOUS

PDF

75.7 KB Created: 2021-08-28 04:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d5c62c88771164adf708e070e041f26 SHA-1: d1fc08eab95dc753d1c235c21d2efc5b3c32f84c SHA-256: f80c5d32d6b12f2c681ffe6165c9e3fe38a119ac791cbe691c1818d03c84483d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The document also features a large number of external links, many hosted on compromised or disposable domains, suggesting a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://ruihuitax.com/files/file/sopozumoxugetejap.pdf In PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/97d2904995839ffbb4613aa191d44c60/rumitoverorinoperola.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/xuvukasegalozekebubosekuz.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/lagina.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/ce6159cc3591422833bb42f414d9b909/86907445770.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/26090001559.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kujudofi.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/99010898045.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/zexiv.pdfIn PDF document text
    • https://immobiliaresancarlotrieste.it/file/64748831373.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/relutalaloladefirufi.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/morufejowowupufuwi.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/boxozib.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/womesarunakuwusikevugifi.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/birozafebikubikiga.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/uu7q1ik6ov7l7gjde9q6fkaprg0ogbm1/penekavulopuboxa.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/d8386a016c31a03b4eb32b67a00edf35/gefoferevevolusubadiworo.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dce62a870d7---51413900732.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae045d8b9f9---2026539511.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/cb193df7bc5a60ff1b28ced80a19da97/26890319309.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940f708f2cc---filudodusitigomivasim.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/0a194a1b4c488585f7861eacdac8571c/37102580986.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/79080405496.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/95879553736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=transformers+forged+to+fight+apkPDF 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_off0000c315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC315 17268 bytes
SHA-256: f83e713c7b4bc92e2bb505c0dd1dbab89cb4453dd8c362b2fdbea1b5c006b470
font_01_sfnt_off0000eff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 10956 bytes
SHA-256: 38ea51edf642dc096d59bbae4e8aed9950d47bf2326362a3ea0a2aa3202a0d0f

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