Malicious PDF — malware analysis report

Static analysis result for SHA-256 438c12b4afede9ef…

MALICIOUS

PDF

74.9 KB Created: 2021-09-01 02:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d4212b47862c10054574ab0669c94749 SHA-1: fd0b30fbadd2e734c58b33f6eb67a5a3fd238551 SHA-256: 438c12b4afede9efcc6912af19ee6b9f9f4540688c89475de2f22f218382e917
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with attempts to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://pixomot.ru/uplcv?utm_term=the+meaning+of+wield PDF link annotation
    • http://aire-limpio.com/img/editor/file/54314489619.pdfIn PDF document text
    • http://newtrierreunion1962.com/clients/6/64/64567561842b0bbd40b956adda0282a7/File/95659714679.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/58bf828afa11c1d055d7451a8099b637/vegerabuvegabutu.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/jaxaradetil.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/937cd591a8a78b6adc58c63bdd83a435/zuzos.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/5615189002.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/fajokubizulavu.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/10555657197.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/81507484761.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/skj1iugbrvm66vgnvjq8l916de/gedadow.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4eaf805d0.pdfIn PDF document text
    • http://apvn.info/userfiles/file/12055207452.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/toraxilowedu.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/lufiradarakinimab.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/89vkn9vbh0hvfk61e2hmrks0k0/powupuze.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16085b21361c79---28291682240.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/72212983087.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/migifipewapusorasijus.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/talufudulirowabalenisa.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/50397459728.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b49622eb63d---26433065041.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ocfk8qdtr38do7qtqfacvenfmr/86771367858.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/26552382182.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/zuzitanijuxudep.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e038e2075---58156199291.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/42867968260.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_off0000be86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 10484 bytes
SHA-256: 4e974dfd8c96ef645ddb64ad5646a93b0fcaf4e56b3e373a0736a9205a59f548
font_02_sfnt_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 17756 bytes
SHA-256: 2eded7a703f2f718f9b445fc40c8990766358308d3133a9519f19394d9dfd0c4

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