Malicious PDF — malware analysis report

Static analysis result for SHA-256 4816be7744d48068…

MALICIOUS

PDF

92.7 KB Created: 2021-07-08 04:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 00cf33acccf7f724ac9bddbd586ca3e6 SHA-1: 76d5d09639d6c34b59a85d1370c6f9935372e0fe SHA-256: 4816be7744d48068b3acd1c51cd801064dde5ea27322e9ae0041da29ae6cbfcc
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The primary purpose appears to be redirecting users to potentially malicious content hosted on these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://synerhu.ru/uplcv?utm_term=php+mvc+tutorial+for+beginners+pdf PDF link annotation
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/4b92feb10c96b0b01671039748bf47da/lizagugalapogibezesuse.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/728b092036db8626984cdb006a976436/fuzawopuf.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac34610ddc8---vevavegikozabati.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160789de06120c---zivusuvomoxukupenatom.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/bejikupokilarotesaj.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/68468810543.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/bunonu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed6e67446c---dedekikifati.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609440c05ff36---284504808.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/lr0o6dedp19es9brl9p9i3moa1/taxinixokeze.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc30a95a31---sefinaxosikewo.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a4ccca2af---lulobedalamikibuge.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/437c5154f36f3dc11a55accf7f8a8cdc/kasikenaseletibejij.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/12146887536.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/4b572372b6bbf8e62a79f1e875bd22b5/4085919485.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/98245594771.pdfIn PDF document text
    • http://zuche0551.com/upload/file/wovixususexemodebimik.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/80541684053.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8246d8ba9---6825562033.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/d8944c7504c5f5be78e6a78116eb8986/gemurajopetewu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/cf06f172a36710530d0a6c2ac1585859/64336375191.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_off00010539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 11376 bytes
SHA-256: 03dd8abda30db6b8b39848a42a934d8cae6210ee5004d394c79565cedcd63c57
font_01_sfnt_off00011f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6A 17764 bytes
SHA-256: 6f42628c7f6865d9fc0622caa282149599f24164a41bf3a08aa1bed9e9a3bae2
font_02_sfnt_off00014d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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