Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ab9a9626bb41c5…

MALICIOUS

PDF

78.8 KB Created: 2021-09-01 00:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 35a6264a1cf8fce220e3add4e2c7d77c SHA-1: e25e8af869cde4c7eabae75ffccca55fe69a424b SHA-256: 91ab9a9626bb41c5036fdcd40895b3fe3c00cae25282d161b674dbf256bb9dcb
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=all+in+one+sst+class+10+pdf+download+free PDF link annotation
    • http://sartoriaventurini.com/userfiles/files/fudakufozefexizafe.pdfIn PDF document text
    • https://mgc.to/sites//web/upload/files/xudibegezuso.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vidimoz.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/990c20f918966de06aebe0180b0b97e3/napemenenafanibobikori.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/lewatapanifir.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/47292118194.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/kuluwatazaruvurujom.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/0307080782e9713f2cf692ed4a9aa3e8/34932732925.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/3418820378.pdfIn PDF document text
    • http://abnicum.ru/files/file/7368678763.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/04aa2b97114ee3a366d9d1d478649bf3/lujig.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/jugevuviluzinefe.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/gakivitemiveserefuzamata.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/45066600625.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609836e7a0362---37327638576.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16108bc426182b---noxevino.pdfIn PDF document text
    • http://stasta.com/userfiles/file/38745490700.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/31850023849.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3022b3138a---nubolinevukopenujalivi.pdfIn PDF document text
    • https://airbays.com/userfiles/file/62920407155.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/26903892722.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/98007092050.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/bc19bp3griuncpbs0tkge984jd/56707080096.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_off0000cb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 10852 bytes
SHA-256: a0ad3f710746e877de37bb1069d53cc23e48dbe029b7128cc4849cb5d25a3346
font_02_sfnt_off0000fcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 18544 bytes
SHA-256: 806f6a3a960616e1c6d512a10cb5e8a64b3f3b37bef80f45b5d80dcf7df495f4

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