Malicious PDF — malware analysis report

Static analysis result for SHA-256 155fd43582d4378d…

MALICIOUS

PDF

72.9 KB Created: 2021-10-03 12:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9393cbd8d2a1d2e7a652060ade3c9683 SHA-1: a979d3eea86858d8a4768828787f22637e797930 SHA-256: 155fd43582d4378d94ce323ba5bd63b8705d10c8339ede46727caae4c4343bed
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised or disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://livingkaneohe.com/userimages/mavitedagedurozidivafutu.pdf In PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/62250799490.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/mividibofijexatiru.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155b9112b752---51209756354.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/rokigala.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/22090620357.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-26-00-21-18-39.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b4735234e---sizuwirobitevukasopev.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/b95ca7836a4dac958de06c83ca1521ad/64705319983.pdfIn PDF document text
    • http://kamila.mebel-moscow.com/content/xuploadimages/file/61183377521.pdfIn PDF document text
    • https://www.suep.gr/ckfinder/userfiles/files/xolisufatikik.pdfIn PDF document text
    • https://russiancosta.ru/ckfinder/userfiles/files/nagukotobuludok.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/babonegalogupar.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/66192199434.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/70268016824.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16152a5cacd0dc---nozibevefevitila.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/17775884085.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/sudolun.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/vevori.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/98348679551.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/a97554fb5022717eeff21d500002c327/zezevebewuwikajiwig.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/41931166543.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/42650859310.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-25/images/files/dirosubuvefijamof.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/jenis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cat+friendly+dogs+for+adoptionPDF 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_off0000b79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB6 10816 bytes
SHA-256: 0a142d735d68fa04d7d9d4e1d10c0d25a7366fcce048e29b2c921d03ea6a4d7b
font_02_sfnt_off0000e895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 17612 bytes
SHA-256: 36feac8abc50dd5754401a792af6a8976c01b4e3ed2a4e53d55cd3cdef40bbe7