Malicious PDF — malware analysis report

Static analysis result for SHA-256 c915a5b69b52cbd2…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 11:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fa83f0ecedc521c7c65664dc3daf7307 SHA-1: 8e4ce3dd6fe3de97b1dd3ad87371c35eab80257c SHA-256: c915a5b69b52cbd2b25297068b897fd78826c7a64f9b7c6a0c6e4c22cbd56145
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The presence of UTM parameters in some URLs suggests an attempt to track user engagement with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=download+fnaf+world+update+3+android PDF link annotation
    • http://18554080.com/userfiles/file/92815441521.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/desemezenukeb.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/verosabajajavekago.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/pks4rua2id8v2ve0hgosbjn9ij/jepogibaloxoxuzemigerose.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/88965160092.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/nonavisa.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161317fb00f23c---zozamevon.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/kajezomemoxirup.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136c527ece82---32229421316.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/39219985670.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16142822f6cbe6---wadowemoju.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/m02pb5ja2v5tni4rm3hgike2n0/zafuxobito.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/14330546895.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/tisesivoru.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/61672332421.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/sawojakubogenujuw.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/godonowaruk.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/bofutivatowategak.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/fekakomi.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9dedb617a---tinutoxotew.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/xakijux.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/varesuvisudurupu.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4a80d8682---voforuripevakozus.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_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 17964 bytes
SHA-256: 7ff86ee8a38be3ae765b38c7e4f4ee92dc6145d387c7dbb7f53b8675cfcc7822
font_02_sfnt_off000121bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BB 10680 bytes
SHA-256: 761d361d4769f8f945306e14b2668a0eecec63daffaba578a421f58149e16f39

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