Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c77f4be34d5a2e3…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 17:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 799a1aa6e940d18f5e580a2557e968fa SHA-1: 71c0590832d161c747e97fadcbb9d93a7dfa950c SHA-256: 8c77f4be34d5a2e3fdb28450b6d533235980dbfac6af3a844378718dc03c7ed0
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many hosted on disposable domains or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=modificare+pdf+in+word+gratis+italiano PDF link annotation
    • https://everestart.com/images/stories/file/giferitumipaxa.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607aca6ce59d5---8843798643.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/26075240275.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087aca85479d---98870422492.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/7fa841295f9de7949cf5931f8466ff9f/towaxemabezirudewagogure.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/81142115923.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/pewixam.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/f40e7ovvl4707n6m0qlesva840/nojejakik.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16085a6afb9487---49909027214.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b810f5bd3b---2056252660.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/nugufupoxinuvuxejivubireb.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88cb13fa35---tevasuriwevo.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/zuzuvumabazisiru.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/farur.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/kidavarivugevopeba.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c125764b0dd---10605479577.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/kg2nunu0l883efpd8m0pssahp7/51316434099.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/gexukuwefugosuseguf.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/9868391621.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b37fb9c535---molokidezinerovira.pdfIn PDF document text
    • http://abc-tel.ru/data/File/18244684104.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c46514d23---wamipudo.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106121144475606.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/69ed0759a317f507a78e8ecdb16d5956/pejubamivagitokawiw.pdfIn PDF document text
    • http://skisun.it/userfiles/files/domoxolaxobanimor.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5b616591c---jituluk.pdfIn PDF document text
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/pafovaj.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_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 10876 bytes
SHA-256: d91549ee723b7d27bd0c67b6c41864d1dc766abf09885a5b1c1fd2d9366b4f5a
font_01_sfnt_off0000f8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 17316 bytes
SHA-256: 234005fe6b34f7c9554b3d9a2fd3672909276cc7ea24b3458d33baf26dfcb145
font_02_sfnt_off00012586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.