Malicious PDF — malware analysis report

Static analysis result for SHA-256 3514b3123493c562…

MALICIOUS

PDF

98.2 KB Created: 2021-08-19 18:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fa086f9badc7f66c1e5c4b6ae9995130 SHA-1: 12c574a75601796737b8a7124728e6824441e9e6 SHA-256: 3514b3123493c562fd18b885fbed6170cfdd1c51b1baef99b3945b52e97cb2c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress sites and disposable hosting, likely to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=manual+de+apicultura+colombia+pdf PDF link annotation
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607f77694eb38---76456979880.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/78968495208.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8469480f91---resilaxazok.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb9c1d97d0---sadidowefapewaw.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16081910e4fd36---sasebojopazofetosorul.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/55813595886.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/83976781674.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/lononulugon.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/lepegulutivugepuvozuvas.pdfIn PDF document text
    • https://digireg.at/upload/pokewaxoxutis.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/55827177757.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/12e6509fc995e6ada154b8eee9df8779/98663774791.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160cffba4efc91---fobelilux.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1628960036.pdfIn PDF document text
    • http://mfahk.com/upload/files/ketedow.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/82100933940.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/52435262902.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/gua1ihvavqgvhir9u5npjn7f43/mowosuxotufuzel.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0359d8a74---tasojopo.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/fesabitowepe.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceea16eefb---pafoposakefupo.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/zowezivuzovuravujitusom.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e48ff3046d6---81483116376.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/fugopezenedewaxobotugu.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_off00011834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001304b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304B 10848 bytes
SHA-256: 5f4774ed6adc667a01a16fdb5f4691aee5f40749ad1c6f5d9e9e6c65329af456
font_02_sfnt_off000148ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FF 18368 bytes
SHA-256: 72840903aecb1a8a408f8f1cc8d9145555c888d9d2b1aed1c22806b659231161

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