Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8853957821a8960…

MALICIOUS

PDF

76.3 KB Created: 2021-08-05 05:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c370e03f744b2f37de336d14648aa330 SHA-1: 2833b389904a60a31af3e354398343165d458e63 SHA-256: a8853957821a8960f9b413838176155dc464e3759142f0b374afab261aede15f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised websites and disposable hosting, likely to distribute phishing content or second-stage malware. The presence of external URI heuristics and link farm detection rules supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=essentials+of+sociology+anthony+giddens+pdf PDF link annotation
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/35699bd198d368896f49bb31f19a9812/8286655475.pdfIn PDF document text
    • http://cy2hand.com/userfiles/89009663057.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798067dfe86---vejabuge.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/38c8dd3d2dac85393141575aaf47a72a/nevowisesisiwuxilu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d27804affa4---dasokusigi.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/37629414b649bb8abf74a85f5ff188c2/fovegopidofujesujiwobelin.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/xikukarafer.pdfIn PDF document text
    • https://icbacademy.com/upload/files/65549820373.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/31124203512.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e9004749714---dupepukijinugomapomovulug.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d8adb0ce4---silawonakiwozuxamu.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/fexik.pdfIn PDF document text
    • https://iohrp.org/f_files/files/54561990168.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c8c110162dd7b10b4c908f82332a037e/betipijituzozevajuwi.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/63592868059.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/67073736141.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/voketaki.pdfIn PDF document text
    • https://cristalensi.com/public/File/mijuginenepibidisonor.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/dijogafevimivozo.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/21653707063.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/zemediridesup.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e70c1ff5f---jakanorasizofawug.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/15119724947.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/52983128368.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_off0000c7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A0 10896 bytes
SHA-256: 9712f8ed9c22a74378d6840e0b84fd583778ac7c7724719e402b3705474fd876
font_01_sfnt_off0000e099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE099 15968 bytes
SHA-256: f671c5587ce96d22abb305d39824368b8b7565783b69ffaa82eff3d7c2c5f03f
font_02_sfnt_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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