Malicious PDF — malware analysis report

Static analysis result for SHA-256 a862fdda0b952c97…

MALICIOUS

PDF

76.1 KB Created: 2021-08-28 11:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6d33e27d1bb25fea995b9bdbdf15efe7 SHA-1: 6a07de6aa90d58b3a046779b2861b566d1163ca6 SHA-256: a862fdda0b952c976287e4d691a412d115671a295aafacca41a04fb59a6796a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this, indicating the PDF's primary function is to act as a lure to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/uplcv?utm_term=adverbs+of+frequency+test+pdf PDF link annotation
    • https://mariellatriolo.it/public/file/73064311148.pdfIn PDF document text
    • http://chinalabware.es/d/files/43031484508.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210624_035625.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774d05e5570---fisobuvom.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/72120706592.pdfIn PDF document text
    • https://ka-base.no/images_content/file/jovoxojojanemutu.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c85cbc43eda---54339469991.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7ca74d002---60099399651.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/64468730490.pdfIn PDF document text
    • http://tcihk.com/userfiles/sizazinimimawo.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/20949018069.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/aruxawerogunefaj.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/18386968319.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/xulisutapisuwidazude.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/6b7a925a2a93fba53c52800eb26b8b78/zofaraloke.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75439689fd---21136809868.pdfIn PDF document text
    • http://dgjst.com/upfile/file/xijesipijosawefijufo.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/laxapebafugavomet.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/xogivaranorufebamubufal.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b257f33ba7ea056147fddf41d489fe2c/93564176862.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/tikesogudujegitimapesotud.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/zamaxiletafodigagode.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a02af52dd2f---96773265074.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/36032608218.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/podelegujekuwukuze.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_off0000c311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC311 17580 bytes
SHA-256: 068568e4fdd86f123846f0b545dba276a35181ba5f03b6b9fc627cad09afc245
font_01_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 10860 bytes
SHA-256: 11de302ca2c9ecab47ca810f0a30e6eb817172fba71b131b146426d143f534f1
font_02_sfnt_off0001089f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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