Malicious PDF — malware analysis report

Static analysis result for SHA-256 71da68935ec8afd2…

MALICIOUS

PDF

87.3 KB Created: 2021-09-04 20:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 246d6c0b61d0653518dd088e3ee8b610 SHA-1: 824c9cbe8578737e3a7bcb4b179d63682e1279c4 SHA-256: 71da68935ec8afd2e57359a0429144c859ad409382444f5d3819b413cdcd2c5f
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to direct users to external content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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 http://i-dron.cz/data/file/60241144432.pdf In PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607014429e029---99956996689.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/97733069207.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/noxirafurima.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/vomulewo.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad51320d1bb---12923345510.pdfIn PDF document text
    • https://taperagi.com/contents//files/pomovokojivugusa.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddac8b2725---nufobuwufusefo.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/1bfec2362936e31421604715b7d91522/50736980951.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1958999297ec82b8a9e091eabc5b64d7/814229769.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/dinofonajunijuraweguba.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/70224325685.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/35575058113.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/jiwavutisatugodadin.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/90b147d3d1408898e02dc928195a806b/20412934154.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/14614612315.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/gowoxevuferoxolewotituwug.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/javiko.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121d13367b2b---libojozosazezi.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/xapexasuxavelivid.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/kikutepafa.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/61422842208.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/k2hl8ij33l3mdj21l32j5ou420/69498387195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=french+conversation+for+beginners+pdfPDF link annotation
    • 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_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 17960 bytes
SHA-256: e6ba97af351efa07fd46a6bd8a9f37342f3268a06f36ff2767beaaf2694f9d37
font_01_sfnt_off00011dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD9 11036 bytes
SHA-256: b6c67bcb79d2ee907443ba53f700047c2f7113c09761fdaa3d471d7987034b45
font_02_sfnt_off00013714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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