Malicious PDF — malware analysis report

Static analysis result for SHA-256 5150694920d9245e…

MALICIOUS

PDF

75.1 KB Created: 2021-09-03 01:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c3b331293238f6777735d2a172668ade SHA-1: 9a5327484bdf2945eb7c617fb406708ec4bd6871 SHA-256: 5150694920d9245e4d654ca78dc2d5c765534ce7fd1ccc31effe1d017687fd18
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress sites, a common technique for distributing phishing lures or malware. The embedded URLs and the PDF structure suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091f6b0e728b---53462084904.pdf In PDF document text
    • https://12shio2.com/contents/files/zuvinidabilokerarose.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb2c7a4146---20838756112.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/5gijti8purvh0nolmmt8fpg04u/15779423560.pdfIn PDF document text
    • https://myhoteltrip.com/userfiles/file/mijixubikex.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/kakinakojobuw.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/75831825966.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/guwuxulubanipe.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/90128351103.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/38150104459.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/17ea465063b8756c269567ee7f3d6296/96278950792.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d72ccd227---26313388648.pdfIn PDF document text
    • https://ubitanduk.com/contents//files/4679561889.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/vunatelejosokedegavazeliz.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/99132139087.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/rumoterizavogawuki.pdfIn PDF document text
    • http://islandpointfl.com/userimages/35919702734.pdfIn PDF document text
    • http://stisk.com/file/99747728969.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e7e244307---jadumapix.pdfIn PDF document text
    • https://akvaguru.hu/user/file/33808871153.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/3950e8058206c69f493291a2132a7cab/fijidujolekagu.pdfIn PDF document text
    • http://aimic.com/userfiles/file/59200129375.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/resumubaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sonance+c6r+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://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_off0000c79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB1 10452 bytes
SHA-256: 767bdc0029b8fd86e6d2cef42084da02ac68c3d7530bb6971e8b6b2e9b5a21f4
font_02_sfnt_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 17444 bytes
SHA-256: 12998247798c306b83b5fbe330ce5418398f4e4d483d7b80f1e501257f217532