Malicious PDF — malware analysis report

Static analysis result for SHA-256 73eede0547aa377b…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 01:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 980a5eb5361e0a7b7dd63dec993d035f SHA-1: cc813725b89332d675f2060f89bcf273c4d3950d SHA-256: 73eede0547aa377b633fb308eba7fb8c51df3c2eb7d3870e42fb7e8035b8339b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI indicators and compromised CMS upload links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allytemp.ru/uplcv?utm_term=critical+paradigm+pdf PDF link annotation
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/8a6733eb39d62597c0f80c1515e3ae81/9244043510.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/tesasazulizilepum.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4524959370---46768739516.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/forijipesobidiwaparezoret.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/95eaae39e8c9d206e4eaf762c64ca23b/madobiwam.pdfIn PDF document text
    • http://119pump.net/d/files/86749964585.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160891564d14e1---lorese.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/luxurusivakapifujokidawom.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///76847170930.pdfIn PDF document text
    • https://aedwea.com/upload/foto/53037670251.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/dd79662970a5cd39d99300dd2857a55f/23480985251.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/a5cd099201732ed64bdc7e4033872f69/nusujegavigoloverag.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104a8da4c965---85515046861.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4e37b24dd---49099542877.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/50468150206.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/kerojagubuxoxapomibi.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607482f97882b---22715993340.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/kutawexivorojanusomulirek.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608573e672c3d---58077910536.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/67130113577.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/60m34er5j7n53k0gbf2h1g0911/tufozirosepuze.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/zonepowefixozidabotidaw.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/43993297806.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_off0000e084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE084 10472 bytes
SHA-256: 0236fa2e9e9ce7d24ada00196d136f13fda422520875ec4ed32ca967ff51d4c9
font_01_sfnt_off0000f818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001102a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102A 18088 bytes
SHA-256: db20d6dd41a69c430fe82f871f679dff49cc4f0c4493ac27c897889387b02708

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