Malicious PDF — malware analysis report

Static analysis result for SHA-256 90eb1bf749bd78d8…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 06:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 69fbc9855c7f3dfbac45846c17c53b0e SHA-1: e67fcd557a3ebe848bc13af4c203aa5c6fdf52b1 SHA-256: 90eb1bf749bd78d89b70d785b32b412c295fe1f1baf69999e2b3b719ad611dba
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised CMS upload directories. This suggests a multi-stage attack where the initial PDF serves to lure users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c5756a62a---dotorojetozan.pdf In PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16087741770403---rilebujaromojokewenunuw.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/waxufexabunadoziretes.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/3hb93rai8ls4ii66kctdq8eb4c/bozuxexareko.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa0e05ea46---61742372305.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/32088269363.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/43746620385.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/87315731501.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/42a7fcec91d44cf4e027c205d9a5d7d5/90595681914.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/letalazokovanuko.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/35412979638.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/libeg.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/zorajuralagokadanogodad.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16126bca9d6462---78270421051.pdfIn PDF document text
    • https://bfull.ru/uploads/files/nuvidolupizegolufizut.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160889e3758024---doliladan.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/dc0087f7f01f399c9916a986771108f1/70070628509.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080adf2809f3---kefafugefepuvoz.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/819b7c36aacf77e3729d122fb8da7270/fitavudekoxarog.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/niwasaderuxab.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bac05939---tojuramemiriwudefedasidul.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/59285971065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=como+hacer+manualidades+con+caracoles+de+marPDF 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_off0000d49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49E 10668 bytes
SHA-256: 1d9a89bc637c3cac08f80c5426031582347b33e7087039569991dadd0b26f002
font_01_sfnt_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 18796 bytes
SHA-256: ee00bfd346d5b454cf6de9ae51f60c55cd0e09d07b40012bdcc579700641087d

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