Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c52ee8c28e217fd…

MALICIOUS

PDF

78.1 KB Created: 2021-10-09 13:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2fee0e20ce3c801583f3c620b2892043 SHA-1: 2e6dba4c077f69c612e081d9e180eb179e291fd2 SHA-256: 7c52ee8c28e217fd2b90e1c37891a13a281c03f5ec5e28e9c7df89fdb6bf976b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://sowaprojekt.pl/files/file/mamexudazipekeruxusilos.pdf In PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/21786078845.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/melopudozefunitomemetor.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615b3f0fdbfd2---saradebodasegusegam.pdfIn PDF document text
    • http://marcvandewiele.com/userfiles/file/bifawagugafipef.pdfIn PDF document text
    • http://nensi.si/upload/file/tinuvokabub.pdfIn PDF document text
    • http://hkalc.com/userfiles/16847251994.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/gejagekaf.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/zobajameredefokipape.pdfIn PDF document text
    • http://okun.su/upload/file/73279357180.pdfIn PDF document text
    • http://apex-architect.ru/images/file/kitaxazubil.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/zijazegug.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/rowovoleluzatiforo.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/1833982706.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144891b63588---74034125986.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/vupusisuwabijaxawa.pdfIn PDF document text
    • https://tekartltd.com/upload/files/rakutobagulopove.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615090ee23a2c---zeberumojetikuvu.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/jinepagepumivi.pdfIn PDF document text
    • http://standardamulet.com/files/files/rawevimaxosigozaruxub.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/45778307964.pdfIn PDF document text
    • http://104408017.linker.tw/files/86699462498.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/61806441086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=learning+spark+2nd+edition+downloadPDF 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_off0000c2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A5 10824 bytes
SHA-256: a743f4c17b0269727905c830729d0ae2cf3c42fdbe20db949ddac97a564a536f
font_01_sfnt_off0000dba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 21288 bytes
SHA-256: 3acf48f514bda6770ac8cd558c56e70e290f39abdadcf7810b21f037a6203ba4

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