Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9bc8341411dd760…

MALICIOUS

PDF

91.2 KB Created: 2021-07-23 21:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0e1bdea87ca2009c5fc78b17637b1f83 SHA-1: c2bd6a35030c127b5f4778ab80cb12aabe850ab1 SHA-256: e9bc8341411dd760b9c07b75adb7f881d1e65b7a2df101a8568d85fad0efbc36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://balticstroy.com/uploads/files/watusuzenivix.pdf In PDF document text
    • http://yjsyrj.com/userfiles/file/6167394798.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87ba633cf3---13763792020.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9127c0ee9---lateragubinofibanozu.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/dasepizujesoxosezobama.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/77791712601.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/9e179a2543d5c05a1d46aadc18b480b3/50408647066.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/673aa4e922be46466baa1506d43332ab/53141696600.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8eeb32225---68100198878.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6c86863d53e60743d602a3fc8e369e67/40225747264.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607857f69b369---99511110541.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/70884708328.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/19754395534.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f4fb2fdf0b8---45322223056.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/333e86eb32dfd9d848d6d0ce79d91160/gobagaseperad.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/fuzejeka.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/51vul5s5hs5mtulelt7bmnr4pd/zowikex.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b59ec973076---zuxorulasisi.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/33189508296.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/57137429801.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088552e3a14f---90739615320.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/677cb2323a4d3ffbe0149a93199ae4c7/71006953490.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b05ef007c50---lurafemakarowab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=chicken+invaders+hack+mod+apkPDF 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_off0000fc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 10824 bytes
SHA-256: af8078aaede8c4128e826b46c4392884434edd727f22f606f7de0bd5e50d215a
font_02_sfnt_off00012ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE2 18696 bytes
SHA-256: 88b81082a314797cd1fa30173ebfb2231d7a9cd7c43468e837f6e1b54a5fa51b

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