Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff78f79a1b564b98…

MALICIOUS

PDF

85.8 KB Created: 2021-09-02 04:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c27746601fd1b385ee4c858b17180221 SHA-1: 8ff0a98ce5626058232e6b7cd7bfd6cfcaedd5c5 SHA-256: ff78f79a1b564b98a32a0eab3b00acf11ce2da6d1b4a4b2903d734bde958db1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://kino-cosmik.ru/sadm_files/2532290299.pdf In PDF document text
    • http://mientaytourist.com/uploads/files/baguzezadaro.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/kebitemotewewixib.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/35865735870.pdfIn PDF document text
    • http://hotstamping.pl/files/file/90756645886.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a6eebd82b---bozutomivanizibuvelowak.pdfIn PDF document text
    • https://asiapharma.la/files/files/20328057903.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/53118hs84jbr4ro2an8dccghde/pujojiralewujovolopakulig.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/bevakutugufumubijut.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2216df93e---25743103653.pdfIn PDF document text
    • http://hongdacable.com/d/files/39377247875.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/90806083906.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/mugomaterozoloriri.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210811062806.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cd295e0f6c0---lezomulonozemed.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/mesekekimuwozakelajeba.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210710120055.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea52d06440---nowifelufuxujolulisu.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/183471427760a677f26957c.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/159977c475ed112c6396ac9860a179c8/78693996528.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091746f26e1b---7449063815.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4a67d5c78bfde7867147ff3b37e57bbf/suxizon.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/752f2b8053d835cdf126e6d077efb52e/98806455496.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///pemawemusixigok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=lord+breathe+your+name+upon+me+lyricsPDF 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_off0000e827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE827 18180 bytes
SHA-256: d3ff6dec736b330c61b6803f3ae4c3f28e254384947174b21ab24fa3ad1bf893
font_01_sfnt_off0001173b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173B 11092 bytes
SHA-256: 87f6b3dda2d8c077debfe7bf991679dc17f0cab5e884b2bd774fab30bfa0048f
font_02_sfnt_off000130ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1