Malicious PDF — malware analysis report

Static analysis result for SHA-256 305d02da58c215bb…

MALICIOUS

PDF

80.1 KB Created: 2021-09-14 04:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 33ef0c23075664df420c61f8dc0a9112 SHA-1: c7618ccc16e159336e11fea49e45b73efbb83b01 SHA-256: 305d02da58c215bb64afe75c5372a9c84e7e2cd4952d7e081c9ac9b468746e96
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. One prominent URL, 'https://coretry.ru/uplcv?utm_term=download+among+us+free+windows', explicitly tries to trick users into downloading a file by impersonating a game download. The presence of PDF-specific heuristics related to URI and link farms further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=download+among+us+free+windows PDF link annotation
    • http://altelaw.com/uploads/image/file/mobewuworadapetoro.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021962027123382.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/60582922726.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/43573532273.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ka6c9017538cm3ml6oskke6qv3/83612871740.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613740a14e3d2---noxiw.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/jebira.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/19448903114.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/dumunawalofevis.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/tabirol.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/96690353450.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/79225717263.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/615355337.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/rujegupefover.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/dijokidu.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/tekilikodosanuxone.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d49cbd0fe4---zunorotiwegafilupatut.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/gudomemig.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/27206727868.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/desepiginolopedosefidufiw.pdfIn PDF document text
    • https://onecre.com/images/content/files/figagen.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/piwalefogozumekotame.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/fagedelomujezisivixanirep.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090720064173499.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6134AA1665563.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/likesirizutozu.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_off0000d8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AF 16084 bytes
SHA-256: 8543988a227f9a0b18776077f4bee7a02345b3559a7abb2569e469ad563c8622
font_01_sfnt_off00010217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 10784 bytes
SHA-256: 6bb7d1ad0bde78ff81e3a96b1110407af62328b6968497fd8c77036e5831f25c
font_02_sfnt_off00011aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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