Malicious PDF — malware analysis report

Static analysis result for SHA-256 645eb3f38f497af2…

MALICIOUS

PDF

88.4 KB Created: 2021-08-09 05:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6c954d6c50631950c42680da82e65fe9 SHA-1: c0f2a5e5c811b4b51a80e2c521b9c7fdce3c5b04 SHA-256: 645eb3f38f497af20a496e986d4c5c736ed3ecb3ff4c760afa5eb78ed3312d64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting, likely serving as a distribution point for phishing or malware. The presence of embedded URLs and the nature of the heuristic firings strongly suggest a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://infrive.ru/uplcv?utm_term=kenshi+buy+house+in+hub PDF link annotation
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc365eab3e---pijanogizumagokunitin.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/5b8260a466bfcba0804819646cdddce4/16869026954.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/15034945353.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/23e0a4af4f7cd5c37c2acd20c3d1c456/xukezadalez.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/70640832716.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/476f684e37a75a7c5ba7493de858b792/fukibemape.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ef648e7c1---32711584130.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/gojugisamirubaso.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/lademuranajuluwopo.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210807175510.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf38d3129---60611005853.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/kanoguketavunelexi.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xizorufogerow.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/c271b2f47063dfd644cbb6398a1003f4/lotobolozulazunosal.pdfIn PDF document text
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/28635026303.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0935ddfcf---96913123386.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c2581c602---41353106916.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/91830335901.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/20879277757.pdfIn PDF document text
    • http://deltools.com/userfiles/file/pipevisema.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608583be0ffd8---5693175886.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/29962844310.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b57cae513---88741322060.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210809055841_86lvvw.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/sesatiwedikirorowa.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103554e1438d---zulubiruzawewaze.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_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 16756 bytes
SHA-256: cb74670ca619fb0b84f5d29a4eae39f04e5b09b97b905ca59e0ba6e7fef04658
font_01_sfnt_off0001251d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251D 10144 bytes
SHA-256: 1d32e9e4aee79f155a4c7e78006b54deb2d8042e4c6932b900ead80cd4787a02
font_02_sfnt_off00013bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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