Malicious PDF — malware analysis report

Static analysis result for SHA-256 15495585ab759478…

MALICIOUS

PDF

97.4 KB Created: 2021-07-06 20:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 14c826ea9418dcc3f4d53448ae33ee36 SHA-1: c03ab98a4a9f47bbb96c096103ac85c5b1301792 SHA-256: 15495585ab7594787ae0e265f8c5fa81c12180a779360300017976419c1f022d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://anatolianlgs.com/userfiles/file/janaxapitividaf.pdf In PDF document text
    • http://chikatere.com/Upload/files/vixojupowefili.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780b8ad2f6f---58531369894.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/8f0e858eb789d4d1f3daa0c4a363b1c6/2995653261.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/derarajuwosutigunun.pdfIn PDF document text
    • http://amdind.com/userfiles/file/firovetukubab.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b2469954332032bf30aa537041e612c6/99051525292.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/faxifefunuwadigitila.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/remifawibe.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/25c1b3c62301e3e92ba1c26c9e75ecbe/jibuk.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c4809279a---dituzamuzemaf.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6a801f1ca---65620128324.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608752f26a23f---89898612875.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fdc9b884e0573f67c753cf7dae034894/72394165922.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/23763001057.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/ziwewepupifenogef.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb82295ca7---9323716811.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/sdetb53qqpjqialjkid83k2i77/kifopigapimutinowamal.pdfIn PDF document text
    • http://mav-auto.ru/images/file/mibutemegipexe.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/xasejefemefabegejeporer.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/2254465356.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/7e4f6f847e8de7a71d5601e20365003a/watupegote.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/wamisoxel.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/66246231898.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/bdee234decc5745e1b7032078fa26040/89032634435.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086126869750---89543276981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+build+a+mob+farmPDF 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_off00011b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B02 10428 bytes
SHA-256: 5eb6ab8b176e480ae85e4421000895ea4b0ea7129f4ccbeeec6783add2e38e4d
font_01_sfnt_off0001329a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329A 17540 bytes
SHA-256: 11c881b25cbde50dd7beca879cb9ca1ccf42157bfe8da0ddba3eeaa764a14f84
font_02_sfnt_off00016038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1