Malicious PDF — malware analysis report

Static analysis result for SHA-256 745eb7565cd33b81…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 10:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6dd617e84f5d14598995da5662681d3 SHA-1: f7a5ebc8bf0b1dda076f62d7633bdae309ff30ff SHA-256: 745eb7565cd33b81ed1e6006afcc4e9705996d8b7c79eb983aa261bb142d39ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for initiating malicious actions. The heuristics indicate that the PDF acts as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • 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://ordineveterinarivenezia.eu/userfiles/files/wizoxipazeg.pdf In PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edb6914f3c---nilinuxox.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/34922622207.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/vinudodujudefises.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/sobivogizozojolamupapev.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/63127816403.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/3663564494.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/toxisiziwomusok.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/kuginusoden.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/lavabukopevaxeliwu.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/1880358816.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/39379297643.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161390b067c4cd---zisozuvomax.pdfIn PDF document text
    • http://momsystem.ru/public/file/bifavazibenabidipafapasu.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/27265888693.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414d9daf626---kagamusafizoxopapan.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/52099944725.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/77242902765.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/zajapekoralolusot.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/31139485618.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/tonukolomupazo.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139389a94de1---69901012060.pdfIn PDF document text
    • http://fohow77.ru/upload/file/bibulofolirozotukigot.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/23741145148.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfece84c3d---14584252620.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/51407121832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=abbas+immunology+10th+edition+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_off0000cac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC2 11356 bytes
SHA-256: 1105e2f7faf074fcd54cffb143a89c1fac7788725ca2327742263a7564ad9ded
font_01_sfnt_off0000e4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FD 23136 bytes
SHA-256: a42146c87ba6860fa9733b0311ba3e8611d91c6fc4abf9bde737252292486ea9
font_02_sfnt_off000120ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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