Malicious PDF — malware analysis report

Static analysis result for SHA-256 65aa9cab01b9b4e0…

MALICIOUS

PDF

119.4 KB Created: 2021-09-02 11:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 51a90089566b23a8c0564e68032c9501 SHA-1: 3c04fcbc3d7f2cf70465935c00832ea24e998426 SHA-256: 65aa9cab01b9b4e0a2aec6a9f7c18b37fc2c2c0a15057c54182ec2479c0cdf02
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=mentes+perigosas+pdf+download+gratis PDF link annotation
    • http://a-kamen.com/userfiles/file/39894633199.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/1981043487.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/lazabopumo.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/nitumegaxizigume.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/jufazutoguxubaposuwe.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160760d29e0702---26837414340.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106081934532439.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ae2639306---31840599617.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/82334098892.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210824191342.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/ximesizizigi.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/9595661890.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96a3d344a3---dosofiwujegazojofupu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b2dd77ae70---67864576789.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-2/20210902120120587242.pdfIn PDF document text
    • http://www.zima.snowcat.pl/admin/ckfinder/userfiles/files/42291519474.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608245b3d01be---40662182714.pdfIn PDF document text
    • http://adveotec.com/img/file/23018043865.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9aa4ac232---16171817028.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/76b22284f20b41253728e37a0ea25990/ditabasa.pdfIn PDF document text
    • http://kleiberit.ru/files/file/lumazofaluzumuwulidujida.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210618190252.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210821164156_pz0a2u.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_off00016dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000185da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185DA 10752 bytes
SHA-256: 351cadd2c45d10fe55a739cd1a6691a9f0d950dae5917360d2d6fa79c7956529
font_02_sfnt_off00019e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E8E 18708 bytes
SHA-256: ca8970c6f1bf8a0ced8512314809e4d8f28995869061ea7cc91fa2f9b2a7fcfc

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