Malicious PDF — malware analysis report

Static analysis result for SHA-256 4401b5e8cca2b9e8…

MALICIOUS

PDF

86.9 KB Created: 2021-06-30 18:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d5527e1976535f3620f83c09f74e8df SHA-1: 3516014f9794f578495903272f94561e752b53ea SHA-256: 4401b5e8cca2b9e8b23468adb2773ba8047f17e69aefa1449c5e5acd754c62f9
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 WordPress sites. These URLs are structured to appear as legitimate document downloads but likely serve as a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=software+project+management+bob+hughes+5th+edition+pdf PDF link annotation
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/hu5mp4u7di669udhgvtdhtnaq2/26196526213.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/555e56639ffb65325508db98233c8eb7/68048343803.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/64194355245.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160875709756df---30623914902.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/85a747dacc1d9cd64c85a10e8760c0a4/33036261238.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/nujezogigunumutevexizopi.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/r38io559al0ov9kes68f0e866a/jonidovibemipo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/os3uus4kpehbqikc7vkjntlpt1/xubawikozebobikab.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/nuzenutevakonusamo.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/44609565467.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e55a3f166---23198710578.pdfIn PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/makokiveribewekovibu.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/69801214491.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071f20413e11---zewijepimisazubizaw.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/fesarojekobumibukolag.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/10575554794.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16095d3be1f9c1---lazagikuremubewopatonude.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/fagunugobuxoxug.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a24df9aae1---16039598998.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd68d24f5---fanegopopexotiw.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/pasubiwarotodofojagajamod.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///75109091425.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/73a4c2a4aa37c7c786b31ae55ea23bb3/zobufezisavefes.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c924e1c0219---mekakigonujinifewebolediz.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_off0000ede4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 17060 bytes
SHA-256: 081a783d470efb80dc35d265f9c0acb299bff6836dc1d8d4ad542a15c7afb074
font_01_sfnt_off00011a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001328f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328F 11684 bytes
SHA-256: 1ada27355e74dd575e692cd6fc380bd22a2c8ba2b117ad6f59e6a5867de78ac2

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