Malicious PDF — malware analysis report

Static analysis result for SHA-256 914e23c454f9f2b4…

MALICIOUS

PDF

92.2 KB Created: 2021-09-06 19:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c3d5861259ff5e5d0153048321115b7 SHA-1: 871f601e592a4922befe29131855192d3f3c530a SHA-256: 914e23c454f9f2b46aa8def2a00520eaf7272c57b0274c270a68c3fee119ea9c
164 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to compromised websites and WordPress upload storage, suggesting an attempt to distribute malware. The presence of a visual download button further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/541enlfv6ari8dgf7e9o6dcrpv/63022110428.pdf In PDF document text
    • http://khachsansapa.vn/webroot/img/files/56766649746.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de2ec774d78---65946031343.pdfIn PDF document text
    • http://gabortech.com/admin/file/50501056959.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/sls6n5tn7uq0llsmd4fcc0fbfb/kikepavovevukozudexewo.pdfIn PDF document text
    • http://eastbrunswickliving.com/clients/77672/File/lunogurujafop.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/nejemewowaba.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/rsqb1vk60tbqd06gt5gmes3lb1/21417075679.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/91121194667.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/24420672837.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/totim.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/pcp8810vg839hdri63s1coprn2/10833237954.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e7907355f16---36985779597.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/86627499807.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/37865035109.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef3ed69127---tabirudowexuritotowopofeb.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/foluwifesevulutedibeluf.pdfIn PDF document text
    • https://wittnebel.dk/file/17933474559.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a8754406---83292250574.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099a50b29789---tezokozizevogolabik.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/lutaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cengage+organic+chemistry+pdf+free+downloadPDF 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_off0000ffd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E7 18584 bytes
SHA-256: 62b8ef55b59a5c7a00406915c9068932908373d532a836db896935c1cf143a1d
font_02_sfnt_off000148af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148AF 11296 bytes
SHA-256: 6c1217db9618c1dcdf7b5cd48cd1b6e31a2d7f0b93647cb49e79b3b527af7c9d

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