Malicious PDF — malware analysis report

Static analysis result for SHA-256 815ce9e24ec61c07…

MALICIOUS

PDF

94.1 KB Created: 2021-09-21 21:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: de979328821850b0e473ab0a9f5b4184 SHA-1: b6a7d7f6aafb87c1b692ab9452fab694176ae24a SHA-256: 815ce9e24ec61c07a3d0c1acd11db658d611ad558ed977af82f26add99ba38f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and embedded URLs are indicative of a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=wrong+turn+part+2+full+movie+download PDF link annotation
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/3c20a54bc034ed0d5b26184a307acde1/karuniwetumofutizaxujeke.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/k7nh2q2222rt115uofmpj3lqd6/37840596719.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/41954639634.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/kusijolurasazojuxi.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/wejozitadisugal.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/19187264388.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/tubirawekapomobinin.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ip1jejgi5lsnk7f5c0q812j8g1/10049122432.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/sg8bqf277abdk5gkh0jj6ndo54/sogegiruvo.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/56938706545.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///boxokomujumepebe.pdfIn PDF document text
    • http://linker-apps.com/files/7286543385.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/maridupapo.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/bijinulexulojumuresus.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/44429390402.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/rutosa.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/77162016009.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/99215324232.pdfIn PDF document text
    • https://activepymes.com/pub/file/xetaketane.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/96785896422.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/30340934680.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/jusivikigudonepodapij.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_off000106dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF4 11040 bytes
SHA-256: 1a8e05586669eb93d1deeeb5ecbd30d19fe895240aa04b6700b308568b8a3c1d
font_02_sfnt_off00013881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13881 19160 bytes
SHA-256: 8031a6b39d4249064494b42b0477dda8e684d9a4f6864a451f5aaa9afcb4663d