Malicious PDF — malware analysis report

Static analysis result for SHA-256 102f28eccdf2143d…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 20:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad2a43b7859216eba4aae01aa56986cc SHA-1: b4583cec5e952b9c7bf2428a9bca45694e2eca1a SHA-256: 102f28eccdf2143dc2fbd6ca4b75ec4e91622cbc296bfc3d31e34586e66a0f50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted from this sample, so the primary attack vector appears to be the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bogema.by/content/Files/demuvebepobagol.pdf In PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gesefobigijaxa.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/zijusezal.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/fuvixum.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/roxosiwemerumenudejozabe.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/jurixotejiw.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/d9hps08213dfh9bph953l707o3/tuxotujetasulozanususepub.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/41730422663.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/bapufubizifuk.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/49670848408.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/wifiwamesoporonufatasuwa.pdfIn PDF document text
    • http://beiks.info/public/file/dedatojovosowedatez.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/1571056478.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075d58446a82---72998522681.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085136405cfe---loraposamefoxakeg.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/xukuvigadap.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/20451089682.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/vdr2v4r2tdjvgt16ibm87n9r30/54202629710.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/c19435118b18028388daf72b33dd52a1/11149446378.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073855ccf4c4---73264697091.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/40381983739.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ccbf65160305f69dbf3610959eba2b66/xufuniwewutufavopuras.pdfIn PDF document text
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/95135074816.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/podin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=process+of+research+design+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_off0000e7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 18456 bytes
SHA-256: c71c7419f3a012af0e14b84c4b5829a448f062fa97cdcf8813eb1469b6ff06b8
font_01_sfnt_off00011716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11716 10756 bytes
SHA-256: 8d9373abc4d7ef573f2270ce214b3426515792e84d2fbdb4938e1259e07894f5
font_02_sfnt_off00012f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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