Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25f52061ac81602…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 15:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: af5feb9e8d900cf13dd9d1dbd1eff46f SHA-1: 5877bc3db0ad2765d8f0d8c2b6036f0f210b817d SHA-256: a25f52061ac81602e6c2ca65f2c32959339b46271259db0e2fe25e5b84979827
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://thepainter.asia/upload/files/guxavugizololedaburuzevo.pdf In PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/gexibobusufo.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/60185933146.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/fivukimotutafop.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/82895710638.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/ponusudopapelo.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/wedoxatajopipuse.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/gijewanamoxe.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/kurezunavitovawipuz.pdfIn PDF document text
    • http://alkanboya.com/files/file///15219941769.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49501783640.pdfIn PDF document text
    • https://nasikampung.info/contents/files/fuzutawexatedirusude.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c3a3bbfa5ce5924ffa700819eeb14865/lokuxojusumelexitetotoj.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/49765179056.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614cccc035ac3---71760819001.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/55748122262.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/ximelola.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2f8de1fb0ef1e2bee2d70a58df95706c/nibova.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/sakesatubovawudozebexuz.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1614d447c31ee1---pavelimopozuwotugeg.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/18157733194.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/mebuvut.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021091900195073499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+print+pdf+file+from+laptopPDF 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_off0000b054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB054 16840 bytes
SHA-256: 5f3c21ab7185dbeb44a180bc2def94b853b8bc62fe1c4e99defa0c1b9a72bf70
font_01_sfnt_off0000db45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB45 10568 bytes
SHA-256: 9af0645f8badb8743b9a7b85594ca3ca1aedadb12348f39c02b6cf5459e91c34
font_02_sfnt_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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