Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d1c164fbb4c747…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 21:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7a45b2b8e306ca553a110dbfe2f2682a SHA-1: 3767dd10395d4f5bae331414027973d58c153e29 SHA-256: a2d1c164fbb4c747c9bfbfb0a19e15203e10b00fb5b43ae17713dd7b0818fbac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious and a phishing attempt. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://coretry.ru/uplcv?utm_term=free+live+wallpaper+app PDF link annotation
    • https://leresto-niort.fr/images/userfiles/files/tojuzobese.pdfIn PDF document text
    • https://iwistw.com/upload/files/25422400094.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/mumofesom.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/9912549769.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613672ad432bd---wiwojisoforakigil.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/99307689061.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/lozumabivisa.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613930131c48a---87007144277.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/76943627769.pdfIn PDF document text
    • http://ccsl.asia/files/28642973819.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/surodotamozurop.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/74982274278.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kcjp53q6voev082q22f7pec643/39828251057.pdfIn PDF document text
    • http://exima.kr/userData/board/file/belak.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/rimizimi.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/47077026612.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/50445240595.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/lukepaz.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613165c838124---jajopedozu.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613072e7c7b78---jatakil.pdfIn PDF document text
    • http://chengzechem.com/upload/files/buvonovavukaxosuni.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/linebelafexiwebo.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/kalepuxuta.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/58233424e88fcd4b876afba2956b4747/ritanukitanuzudusawuzav.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/vafunepogorujoresenefokew.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/84090686980.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_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 17984 bytes
SHA-256: 966ca2e0319dff54d108ece35204b96b7558c10908cff1c18d48d6841839ed4a
font_01_sfnt_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12681 9884 bytes
SHA-256: 982bd75f1ed177f24669286752af61867cda133e7410f3fe3957b3bdbe6002eb

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