Malicious PDF — malware analysis report

Static analysis result for SHA-256 125b6154ffdb8c4c…

MALICIOUS

PDF

75.4 KB Created: 2021-09-03 04:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7155ca3efd1b586af9bf29ec4be6e170 SHA-1: 2ff50ef826199d1b2c2c7899e0194a2e624c64dd SHA-256: 125b6154ffdb8c4c31dd4fb4b1afe4d0adb33a553dbad12a8295c09c9568239c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://irlanc.ru/uplcv?utm_term=trigonometria+plana+de+sparks+pdf PDF link annotation
    • https://caraudioshop.ro/mm/file/patazaxemejiligune.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/73582711202.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/19459011636.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/19583195946.pdfIn PDF document text
    • http://apcmagon.com/userfiles/47104873395.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4510ceb663---lonodixomap.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/f9621tc588932aht31v9ki9fqm/56494851757.pdfIn PDF document text
    • http://ashioke.com/images/library/File/lutomugozetol.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/48286611038857e8895162cc50b2ab48/39760135011.pdfIn PDF document text
    • http://scriptonica.ru/files/files/33875141683.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/bb345ea567671df95873095e29b1dfc6/tinajerasunidur.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/03768c017eb8dba49d3219a326fb5f20/81765965771.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0ef44676---velononudosaxowapese.pdfIn PDF document text
    • https://activepymes.com/pub/file/15141251716.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/53765898352.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/90602424980.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/89238120544.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/zodosodixavalimoliviw.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/51290383586.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161165ef4a13ac---35456510398.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/27527253275.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/supixivosijegusorubul.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e1bcf6193cc8fe615c211e060956fe05/57703705194.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/358a83980bf3fda1c805ec17b3c8ce24/1099945855.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_off0000be24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63B 10896 bytes
SHA-256: 911ee22629b7ffbd833d724f0239565782a6b3d7ce994fc2cfc676c4559a3a0b
font_02_sfnt_off0000ef31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF31 18432 bytes
SHA-256: 13d56cc000e29f41ceacd237f1070dd1ec9c108379ab80d3fdad46b1d1798ecc

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