Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1de7a9a82e0c6a…

MALICIOUS

PDF

68.0 KB Created: 2021-09-25 00:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ade68f435b82712484ba70da31807aa SHA-1: 3c090c3a154450c410d7067871a3a825ccd84cca SHA-256: dd1de7a9a82e0c6ad654d471f12bdccc3c0f5a84e38488a3352532a2430fd73d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to hide clickable links. It contains numerous external URIs pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://synerhu.ru/uplcv?utm_term=how+to+cut+paste+photo+in+android PDF link annotation
    • https://unitedfightalliance.com/ckfinder/userfiles/files/94185877132.pdfIn PDF document text
    • http://clingac.com/d/files/43928652965.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/binaxezarusi.pdfIn PDF document text
    • https://korankertas.com/contents/files/wajopimixafematizadugar.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/judalumukijurolok.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/36047736435.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210908025836.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466bdf8bfde---54891131481.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210919063044.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/vexebebosur.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/28094335837.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/konopuxatobapolitaxavuz.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/23993441351.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/tagivajovabizebad.pdfIn PDF document text
    • http://sinners-party.de/media/file/19071543813.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/fiburidata.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caba87cf08---30775312125.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/silibipufufifotekitimux.pdfIn PDF document text
    • https://fasleh.net/Files/files/xezezelukavolis.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/widizerokutiwosuwexi.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486e2c33067---bogiripol.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/3f5d341cb145c2d1decc90c9b0b1e40a/73440374049.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/kubufadarefelikidupune.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_off0000add2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD2 14272 bytes
SHA-256: 9562f16c207a3dec4647f8d0447981ecde961cb4e2a03ff055213cf7fd2e7671
font_01_sfnt_off0000d1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 10740 bytes
SHA-256: 567bc1bd15b77270b7e6858d1303e54035b1cdc1dd39c3c790c42294dbe84345

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