Malicious PDF — malware analysis report

Static analysis result for SHA-256 2125ef265b1aef78…

MALICIOUS

PDF

104.6 KB Created: 2021-07-26 10:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d36ba34ac9d1e63ddff87830170e2e7a SHA-1: 7021c8ee8906266af2fdb0ed033ede02819a209d SHA-256: 2125ef265b1aef780156e542c2812f13ccf25dd88cb7cbc3ede67d5a252777a6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised CMS platforms. The embedded URLs suggest a lure, possibly for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://accessiblevehicleservices.com/userfiles/file/jotar.pdf In PDF document text
    • http://juha.be/_files/file/46733369324.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ce980612d---66577212558.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/nifuwe.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/ramejalozuxazutet.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abbbfe864d---15371412726.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/rubinizapamopupezedaxeniw.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/49eeed236072b7dc727e32f764226c7f/bunag.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/nutawalulagekupoleror.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/kotededakixijolepi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1be8423f5e---rosaxij.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0fdf3d273d---51779494435.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/33c83c248bb36652c329faed9265f22f/fekob.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/1924609467.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078472a980c8---pajexolobirobepavesipifu.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/79316873839.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160823409b9226---zerisomapebanusu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1656a847f---siwopivipojumorajij.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/laporiked.pdfIn PDF document text
    • http://rapet.hu/files/51236568886.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/63a5b894c4d7085424ef9cce9e571d69/voweb.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/4904348857.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/33503842441.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff60d6f9e2---32586032627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=dell+venue+8+pro+charger+specsPDF 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_off000134ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EF 17880 bytes
SHA-256: dd9688ad8d30ca6c8dfba122602b7ed5f757b763c5548cef0a5f4f25af579bbf
font_01_sfnt_off000163cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163CD 10836 bytes
SHA-256: 488159c07f916ca1ff7ce80c37c31b1b88bcdf503a91ceedbc9cb91bc6dafdeb
font_02_sfnt_off00017cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1