Malicious PDF — malware analysis report

Static analysis result for SHA-256 f275921909245a61…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 14:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 95cb063c44998c88891dbb20776f4b76 SHA-1: 8cf8386822c380a18dc84b0024623580d7f95475 SHA-256: f275921909245a61794ccc32ac05c67429ada85aff90a452a1206c41488f8b8f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The presence of numerous links, including one to a compromised WordPress upload directory, suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://monarchiaerembolt.hu/tmp/82180710106.pdf In PDF document text
    • https://prawobrzeze.info/userfiles/file/16778942882.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/343osqivtg0g9jrscvreg7jgvu/29766513119.pdfIn PDF document text
    • https://sabunwangi.com/contents//files/gaxezewivoxedelasabitu.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/zokenidovaxebejesepewiza.pdfIn PDF document text
    • http://prmakeup.com/Image/files/fuxinitil.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/vanukomezezar.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/tbo00j8aubmml79h1legq52q74/pabasulebof.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210811012416658.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/xizomajoxugesufi.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/vonapok.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/gitulezujebelizati.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/jepolefo.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/jumekusadunigeja.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/dozalilonosife.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a3ca9f28e---43912522292.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/87028420086.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5dde5cd39---vatusususufigalekerusesu.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/078ec36069f9bdc9b164e88bf143a3b3/fenuzelek.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/fexivarajafetom.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8f5704863---21662308989.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817bb12c2dd---tofumiwevixufimijinapu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bb7a137e---sofovisuk.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/podurunifalipaxokigirituf.pdfIn PDF document text
    • https://htchninc.com/d/files/jevaxefamobutobe.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608728c7d8042---56089392237.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1612fee8798b50---dekofuniwazinugak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cisco+video+conferencing+system+pdfPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/xixuretari.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_off0000e5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 10968 bytes
SHA-256: 6c40e2668f37712b4238aa289fa8ea19d5fa36ef031e16561e8645649c91bd4b
font_01_sfnt_off0000fef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11703 16880 bytes
SHA-256: 0960a1b96f1f9924e8664d4816c9e4e49ece9d06fdd32530c93c4c934b2413b5

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