Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab449c5af953d163…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 00:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f3ac8669e5f8890150112d683c473ac9 SHA-1: 42e0257d1d9e7a5b12a7b9a3a8126cb436046a9d SHA-256: ab449c5af953d163c328edd15c62befc578300bc51d27c1ea5f68abaa442124c
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://digireg.cz/upload/18935578559.pdf In PDF document text
    • http://zhizhencn.com/filespath/files/20210905232733.pdfIn PDF document text
    • http://www.neocota.com/fckimages/file/41258221881.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76741013ba---madomedizopumumibegisa.pdfIn PDF document text
    • http://redsky.tv/userfiles/files/72600149751.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/9cc7895034257d9721266e0c594a4339/motelafikobare.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/bavudufob.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/1517937715.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4adade969---fujevuvilosijigezipimiwof.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/56902942002.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/13560941802.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/lobaduvetegokatajarika.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b13c88725faf0f6c1265ef4943398a8c/xedosixelidowizu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b836523add2---vilesezabofafa.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7aojj1aq686masf9d4rp6lk53c/73853192168.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/wutulegusel.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/06639103ebb5bb12237b1905cb84330c/ralapusafaka.pdfIn PDF document text
    • http://rotang.net/userfiles/file/xatodabulujurenum.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/vavoburorefaginul.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/31105989349.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/7be4b5d7e8ed3b7961c461013d61e318/90511245761.pdfIn PDF document text
    • http://mamsongdamchoi.com/images/chua-phan-loai/files/19506621383.pdfIn PDF document text
    • https://noddy.nu/images/file/timewunomowivoxut.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078be59081b7---litawowotovinoluvapodosim.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/tojusunotuzixid.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/95174474078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=architectural+heritage+of+pakistan+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_off0000d8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 11072 bytes
SHA-256: 05c1112b756cad4fd729806d53470b298bf6981955a137e8e92b88463c6b578a
font_01_sfnt_off0000f261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF261 17792 bytes
SHA-256: fee38b011aa0620fe10774dd5df6bb528d1d38fc3747c68480dc27dfa1a215d5
font_02_sfnt_off00011f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1