Malicious PDF — malware analysis report

Static analysis result for SHA-256 8321202bf6b244f8…

MALICIOUS

PDF

71.6 KB Created: 2021-10-03 12:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c8ee5df8326d5a86c81a5dd9d4229ce9 SHA-1: 33df38f2f337df8113c360fbe76ec4deccbb2684 SHA-256: 8321202bf6b244f8a74183ec63f7b2adfd06b1f6dd2912026ca0d8cfd41aab4e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised CMS platforms or disposable hosting. The PDF's structure and embedded links strongly suggest an intent to lure users to malicious websites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://wastran.ru/uplcv?utm_term=tomato+plants+look+wilted PDF link annotation
    • https://newsru.md/upload/userfiles/files/38764939749.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/62038958629.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/giwiwevova.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/pokupavezoriv.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/39312399783.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/39096861394.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/6409778482.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16147c2c5432ca---48408236367.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/panetizewugatep.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/63486982902.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/garemasasebefezurikero.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/mibezusugodaxufubef.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/218452823.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/maginosadasenazumokixex.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210901232201.pdfIn PDF document text
    • http://artcvajk.friendship-match.com/upload/files/julapoxokojidadaxuke.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348865531d0---74423888762.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161499d1ebe2c3---8548201546.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/jirokireloluru.pdfIn PDF document text
    • https://renault-service.com/userfiles/62105886714.pdfIn PDF document text
    • http://hidropro.hu/upload/xudazemaxonunimaw.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/fipivag.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/remenilapakawozikoguro.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161582a5301618---likiveb.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zelim.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/62026666309.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/38578140369.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_off0000b739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB739 10596 bytes
SHA-256: 00cca75656a27947c96b235da00c71009d578dca1f2894f7c6d655bc5232d88a
font_01_sfnt_off0000cf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF76 16144 bytes
SHA-256: 6c408e09f736f41e74e1b7dabe5871cf532556d0f72ce3020d97d9eea11ab065
font_02_sfnt_off0000f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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