Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c694faf2c5243a…

MALICIOUS

PDF

73.6 KB Created: 2021-09-07 15:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6421185733676df085556cfb81b1d2d8 SHA-1: ec2c65fada00ff37b0cd9f2cd695195af867ace9 SHA-256: 50c694faf2c5243aa56e4a6067a95ee93212bca0b06c576a5cdfcd22da6cbcce
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of these links indicates an attempt to redirect users to malicious external sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=unity+of+command+ii+manual+pdf PDF link annotation
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607769046875a---soseletotazojilezivoxabax.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/lf41ue4pe7u2i1vjvomlh6djpj/93195611178.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7c9a1da91---nukefumalipomejozajij.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c955789d58f---kilakatakevifaj.pdfIn PDF document text
    • https://gilbertems.com/videos/file/1706288717.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/91002132035.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0a447d5ee---67085305947.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/12902637208.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/91767585653.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/kebosivivepazelamifomoke.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/zukurakinimogoku.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/wutufuvakosawasekike.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/dusumoboguwivekokoxo.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/3bb5k9pued4mpofrtl1vdr1ha1/91170082005.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a20d2466bb4---16123525740.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/dinojufezoxezefukoxaxagam.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a0cb7723e---92591163669.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210531_B7FBD3E864237AFA.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/vefitepozajozanotapeses.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202107/file/21072217544334748467u99ax0d3gr.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/vinowazonuba.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/nifokoput.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_off0000bcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC3 16864 bytes
SHA-256: ba8684979393bdf300fa891616b0e01491ec3a8dd6ca4c9cc6e3bbd4b0f5d476
font_01_sfnt_off0000e832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10049 10604 bytes
SHA-256: ee0fe0fbbc0b3fe44732758599703fb40cdb35db65111c597d1e7a2709016ae9

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