Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c5688641c1e012…

MALICIOUS

PDF

80.1 KB Created: 2021-08-31 08:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9f9e46e779d927fc7d0cb9c646aee89 SHA-1: b919875a9c621db71171bcbefad3955704c6b591 SHA-256: 93c5688641c1e012f3a70060fe058df9658232dfb6c70fbebb383c1447f60c25
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and UTM parameters further supports the hypothesis of a phishing or malware distribution campaign.

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://smidgel.ru/uplcv?utm_term=fish+tacos+with+slaw+and+avocado PDF link annotation
    • https://digicpictures.com/downloads/55840849602.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/21332210019.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/75664996345.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/fadagevevet.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dc227e8bd55---zowimosutejamiponumazoku.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/758738b73e9df7a58bd71245a450d451/16943364003.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/dunuboteninadefixo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/burusidiwivunuzen.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/b8d5a164036a6a721ee421a26e247c8b/dusugatezibadava.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/84289715470.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-23/20210623011028603642.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/lubizatelo.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8b381852b---rimuxulizofizu.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/b69lv1t7v6m8lid7gipehkl7l1/77615239353.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/jatinib.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/93984862631.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/61603205436.pdfIn PDF document text
    • http://edgecs.net/documents/88320778756.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/jeditolatanuremugozuwe.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/97223143586.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/warorevatuvidesokikobe.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9c285aec---dibukaxidid.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070caf604d92---rapukibozegisumumubasaxe.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/41242414573.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cf53b36a6e---75740354744.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_off0000d051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 19072 bytes
SHA-256: be2579f5154bd2355a42c9c00efc63d232e42e341cd350ebc18b69fd2bb92916
font_02_sfnt_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 10364 bytes
SHA-256: b41759a7f44b7a346ee0fd2e80db5d9fd5717643eb0b55d7e9a7a3b9711ec8f1

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