Malicious PDF — malware analysis report

Static analysis result for SHA-256 596f0cdead15a4f3…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 13:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f9d78c26f45514991ff1f5278217d40a SHA-1: 0a0d1f0a46920be7e5e648bd099c77c611887b54 SHA-256: 596f0cdead15a4f3913aba0bd58c6a5786de4425d5e5379edbca66e485bdf972
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many hosted on compromised CMS platforms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further compromise. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://upasamed.org/Content/uploads/files/filezedowikemexu.pdf In PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/bqlnfm75s5m1upjp7l7uckkfbp/levon.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/9798900877.pdfIn PDF document text
    • http://hongdacable.com/d/files/56725395733.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/11631139527.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/4641108465.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/wivepererebizabakowon.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/birirevorevagubiwe.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613573d7cb285---37500135674.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/60794157761.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/netubumalokubigigopab.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109110243469116.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/gekifevagenabumomudefekid.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/webovemusaxerojuliwa.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/powevitatumej.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393860c3661---luximewu.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/40356412531.pdfIn PDF document text
    • http://gzwep.com/img/file/20219161392.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/sogojakisiminaxofotudisa.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/zonanewozew.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/16795601379.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16136d6ad409f6---jugofuzefa.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/pofalinujemag.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/nuwuzepodemevugev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=no+root+apk+pubgPDF 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_off0000d8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B4 18324 bytes
SHA-256: 08dc7664d82f27a4d4cb1a6e6d095f584e9075d3768ddf4f494c6ee7c90bde1b
font_01_sfnt_off00010830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10830 10196 bytes
SHA-256: 401d612e4c8657016ac4abf6cda37365bdeb83f03ee804d2c1bef3c04546748e
font_02_sfnt_off00011ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1