Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d1fb07e85d793a…

MALICIOUS

PDF

81.6 KB Created: 2021-08-23 19:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f4156fe20770b81ecdd61394e803e2c5 SHA-1: 9ccff77b707b844dcc6503fa4f48c2393922fe79 SHA-256: 28d1fb07e85d793a43f2808ad9e8658dc7dbc162fde9fa393ba56c6c942b1e50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs pointing to various websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. This structure strongly suggests a link farm designed to redirect users to malicious sites, likely for phishing or malware delivery. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://garglob.ru/uplcv?utm_term=how+to+combine+scanned+documents PDF link annotation
    • http://fw-simple.com/uploads/files/nobaliwokuseduposabab.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/98062169402.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/kusidakejafopike.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610ea329e64b3---zibagolu.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/93301200534.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/33e4bd97f6997f97fb226d43f674bca4/10381538454.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e1738b03---59196639659.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/86103208106.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ee3l9ok4thegg5bkjdnk53pof5/45740540126.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/bijunoli.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/28494975526.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a73d0cb22---rifejigepelidileseje.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/romonoso.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/judoxo.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/dusuz.pdfIn PDF document text
    • https://micsys.in/userfiles/file/60857978941.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/lonusepoz.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202108211416387677.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/b499bbc0e0f3966aecca61e4d2862ec2/bawinume.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/37060016310.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29059979593.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/gomemugomixabogeve.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c7554bbb7bf---pawazirisakuxolopitenopa.pdfIn PDF document text
    • 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_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF547 16396 bytes
SHA-256: ff306cb7eb8c3f3f2c52c5d47339e1638331a02a741c8579c74d34c047e28647
font_02_sfnt_off00011ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF9 10704 bytes
SHA-256: 634752bef35971f0914a1c038b3a4055eab7bbd50c3be4f157403d6089239f08

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