Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35af766d82063d3…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 20:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e245c8fa7d31daf730c2a581108b1b8e SHA-1: 499294ccc699012506d14b8f8cafefb22d6e3871 SHA-256: c35af766d82063d3778e50c1d7fe09bfbf3a5a04dc7665c726f4f50693a7d086
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The 'SE_INVOICE_LURE' heuristic further indicates a potential payment scam or invoice-related phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160f22a6861bd5---81391520678.pdf In PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/94339993473.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ba5506c82---2591714513.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/80966929400.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b33bdb008---nibigetupedawivowag.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/59917910386.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/pirenezegugomufilulipawon.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/60612976348.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/79827347868.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/79362997557.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd62b12649---60867882833.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609aeec6d8159---namaxamofowoma.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/32433801267.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/nudasimogavexopila.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/1dc7f25f398d72d38dfa7042b29deb59/69287960099.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d8955eb96---2500653511.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831a39b9143---bevepanabiji.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc8c0bdc2b---74787838855.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/pazokajodikilezajokedigix.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/9943459029.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/9c3b251456a9ac5197dd13516a5b2ef9/medotetapubavuv.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aafd56c7ba---woribugukebajiragaxal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=paytm+accepted+here+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_off0000d5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 10472 bytes
SHA-256: e050ae11a89e773e92f7f599114452cc436eb3b38dd54407b80225351e97f0dd
font_02_sfnt_off000105d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 18524 bytes
SHA-256: 45153c8f1595a84d5df4126ee6a818919a9d20c31932daaa63f8cf2e2bc88c3a

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