Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb8c2ced07284d8…

MALICIOUS

PDF

92.0 KB Created: 2021-06-30 01:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b5f5188e726bd0cec148aacf69c181dd SHA-1: 5ebfbeb5d031ee8db83ed3d6cd4d51ec8d59442f SHA-256: 8bb8c2ced07284d85e980b931bc980dcb8bbaa719684275a08692c11f3a691f7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, likely intended to redirect users to phishing pages. No scripts were extracted, but the presence of numerous external links and the high confidence detection indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 https://chcial.ru/uplcv?utm_term=convert+note+to+pdf+iphone PDF link annotation
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/ecbc72fedd445f07800ac27c2bcdcc91/risuvebegij.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ce8988615---tijususagilumaxul.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/77485612112.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d0df9e15c---dubexabijupovoku.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b49a88f7f---28047974243.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea8190045---sejomota.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/13738424f48a441ad74549987cc5e8aa/zijef.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/97385846368.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/guregarufemix.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef6d087192---59177984734.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/satedazuz.pdfIn PDF document text
    • http://www.moyekolodin.com/files/pededebiwapovapizidenagef.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b12ca5adde6---gulir.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acd6bb6ce6f---47447029773.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/15ae565749567ef056a6c596658bae4a/jazuxigeg.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160897154054a4---viralej.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/lu08iotpmighroblll8ofeoum6/18802526824.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/bilolemaremewigakiroz.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/livinumebikepunepe.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/xezatidujofawoxevosetakan.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094c138eb50f---10409429890.pdfIn PDF document text
    • http://canadanur.com/resimler/files/jikotek.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 17596 bytes
SHA-256: 33223796300408814a11367afa7ace555bdb088b516f872d23fe4b1363d8ae5c
font_01_sfnt_off00011d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D45 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off00013350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B67 10316 bytes
SHA-256: 798fc054d4dee1034ce12a3c1b7515ab3f8a931b7e0c8da601f27e53ccb1628c

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