Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ec3a629dcd8e9a…

MALICIOUS

PDF

109.9 KB Created: 2021-06-26 15:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4f09fbd870d3c3150c1fae0c908c630d SHA-1: f62d66227a5c8a54a5c03df1841cd57083a308c6 SHA-256: e4ec3a629dcd8e9a00245dec114d485846015a9c0758d35764c1c03d0581e039
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress upload directories and other disposable hosting sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to redirect users to malicious sites, likely for phishing or malware delivery. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/52b6ccecdd3f139886226fde48ac6008/95032652239.pdf In PDF document text
    • https://bangvetthuong.com/luutru/files/54514581121.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/lemowowuzopafako.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/o092k7u7t2o9rd5qmhd3shaddk/xedosudajiku.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/7701104015.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb24dd9fc0e---lalakamukilotesel.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/fb33f5070cecef51ef6c8cee8de88339/dafatuzer.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d231c3c20adaee18563e2b0475828fb6/sofakemaxuvamarubonize.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e86f4e3cf---rolez.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/5675701756.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/961bc29914ebd4208b3a7f38f64fdf43/83981916237.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/66817135091.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b50dd8ecf---litarelit.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f4601acaa---bujoniputimewefupulopuru.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/c899351bec1759f92c484c5345105579/39737407200.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afe22001b76---96917168849.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a607ed38e---38684418492.pdfIn PDF document text
    • http://cortabellanews.com/userimages/24507418659.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad993445672---duguxaxipodiroxovajewufer.pdfIn PDF document text
    • http://fygl.net/uploads/file/050659203834.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19499114966.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/ea492ce9f55665c28073aa3ab077c640/5948374617.pdfIn PDF document text
    • http://drironcat.com/images/file/sofozevanotavasami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=natural+resources+committeePDF 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_off000150bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150BC 16388 bytes
SHA-256: 9bfc698d5f8e5b06457a33ba163727d8cd8d596efc2155abfe774057eca40fa7
font_01_sfnt_off00017ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE7 10364 bytes
SHA-256: f1505d92b107dab2a9dd97ae0e71d1da083a6fca15851fb638988f3591c2ef07
font_02_sfnt_off00019265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1