Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9e7b3a2fa5ca99…

MALICIOUS

PDF

69.5 KB Created: 2021-10-03 02:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8f635f2b1fba59bd91e4a9b23a2a5170 SHA-1: 619ceea7dc6401c3c9be315d559b386afba8c29a SHA-256: fe9e7b3a2fa5ca99ce9cfbcaf9c640d49971de39be5baebbcf737621cc361511
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the document is designed to distribute traffic to potentially harmful sites. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://garglob.ru/uplcv?utm_term=how+to+grow+kale+from+scraps PDF link annotation
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/kawug.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e56e292893f28c13bb11f0b7985c29fe/12786858505.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ba40203f6dfe7daec57a5bf414f39c10/fisazoxor.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/ravisujezup.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/53776576730.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16156bd9970459---73994973534.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/kitixerukalokilivafuge.pdfIn PDF document text
    • http://scantech3d.com/files/dokebowekuwigamubunadaw.pdfIn PDF document text
    • http://boxethai38.com/upload/file/63753102780.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/jibasato.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/93172733025.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/90057512402.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/48607520821.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/jigovenebidat.pdfIn PDF document text
    • http://fpole.ru/sadm_files/29998112547.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/95246413302.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/xuxekogerenedabawevejik.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/98280938191.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/bobamuviwokefapot.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/vuvefemoluborevi.pdfIn PDF document text
    • https://aventuraholidays.elladatravel.ro/mm/file/venasazejakebojoz.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/tolafiwubajuko.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/wisokanodumedajozukil.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/1326006271.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9e65c2eaf1f67b40e05cd4bcd07fbd4e/pawivovorekobesugikener.pdfIn PDF document text
    • https://adikketiga.com/contents/files/24291061771.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_off0000b1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EA 14892 bytes
SHA-256: 620ad52b1992d8155b8bc896093243accc16eacf95cd332b3647e829ac9f6b67
font_01_sfnt_off0000d799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 10796 bytes
SHA-256: 6503648919751445654e8b1e7307c1e70cbe14d664399b617724c6a9292bbe6a

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