Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c43f549f574403…

MALICIOUS

PDF

87.7 KB Created: 2021-08-02 06:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1260f13a02cf32aedd5421ef70dfdf9 SHA-1: 3065dd22f97c5c8bab2a75bc2e4ffb70e2c408b1 SHA-256: 23c43f549f574403a52b49adc5a2327b4d82a1f79739d5766edacc3abe493ca2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs clearly point to a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://ahkkpcm.org/userfiles/wumalipewegolanuku.pdf In PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607930415b65a---66553828278.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/27079829106.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/u8694arn9n8f6f9inl4fvmuouh/denavebevuvozuxesawes.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210624093535.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/laxisajororebigenusufa.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078df37d588a---tixalapolomobidijiwow.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bab8933128e---wurufuzenusosuwefoner.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608638e361bee---94370837772.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb4e87dec9---fomubusiwivuziz.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/80751745839.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ftc6b1ue3lgd4lfedkv3at7umv/xukidutamirosozosojedagib.pdfIn PDF document text
    • https://hse.tw/upload/file/72682352044.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/26490597145.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/ralipepito.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/putarad.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d827eb7e4c---46561255147.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/gevukukitugumitasit.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-25/20210725211710781064.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/72563466522.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/60138339565.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f49dee50b---lozaj.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/sd7voroljogfeqq0jf08v807a5/42043142099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ged+math+practice+test+pdfPDF link annotation
    • 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_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 18528 bytes
SHA-256: a3eb172e12ad503d79451d46332bb353edef64542be2c79241470664ff87bc09
font_02_sfnt_off00013793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13793 10652 bytes
SHA-256: e0128153e10c6312a8a31696a798b8a1fa9d7a6b2e8f6dbdc9214f97930079f8

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