Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb84ede7fd6dbe4…

MALICIOUS

PDF

91.6 KB Created: 2021-09-03 09:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f7fac31893c980da28bd11f7fdaa833e SHA-1: 9766d1ce9f7960ac6fde12e284c2b4268838b97f SHA-256: 8cb84ede7fd6dbe4e334095773b6b085cf6a4088ba8df5eafc2cfa4f87927569
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be directing users to potentially malicious or phishing sites through a network of links, some hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://computerzone.pk/file/fasurujomapujubikuno.pdf In PDF document text
    • http://alibabashipping.com/userfiles/file/nesutakirepedubuletas.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a11fab6324---12654736122.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929f9e4de4e---31517747266.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/tisejuvabapi.pdfIn PDF document text
    • http://bulmarconsult.com/files/2834331807.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/suregibejewepipekutijela.pdfIn PDF document text
    • https://5uempat.com/contents//files/37096244042.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608910bc32e97---91137131194.pdfIn PDF document text
    • https://virker-ikke.dk/files/40627179389.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/zikubexedabimulasunubu.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7bfc78928edd85e34ff68dcc5fad316e/zotuvefusewozapored.pdfIn PDF document text
    • https://alutat.com/data/file/61828747252.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/10ajrssj3svhkdjth6dk9a9ni3/63364140194.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102eb2bbe3ed---32109159066.pdfIn PDF document text
    • http://full814.com/upload/files/81401405902.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/10821903469.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/mukejimafisalajosolo.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/wiwemuxulajabaj.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/6297953809.pdfIn PDF document text
    • http://fairmonteast1969.com/clients/876766/File/gerogenipudijujelek.pdfIn PDF document text
    • http://arlingtonhigh1960.com/clients/881088/File/49228148580.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/59210764716.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7abe7c0f4---liruzawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=philosophers+of+education+and+their+contribution+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_off0000fe4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11662 10956 bytes
SHA-256: d60700b1ac69857a7fd25d0704857999619eedc00b77c5592c22e82c1d888725
font_02_sfnt_off00012f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F82 19080 bytes
SHA-256: 3875422ee869d167f6091e3035a6abc2dda6af143e3c28a70a6f90aa6043eb6f

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