Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d26e46953f7d5ff…

MALICIOUS

PDF

85.1 KB Created: 2021-06-28 17:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 81ef238d69f1b73904ce42893f8824e8 SHA-1: d277b3b8a8d3d32d06990a243ea36616a11b4c10 SHA-256: 1d26e46953f7d5ff2ecce97cc33f045b860d5975c80ffa31be4bfe6d42edc3b3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick the user into calling a phone number for a fake issue. While no scripts were explicitly extracted, the presence of numerous links to potentially compromised WordPress sites suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/li1hgr41bqf335bs9t3545holn/jivipan.pdf In PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607af56521bcb---wozefojeju.pdfIn PDF document text
    • http://goldmustang.ru/files/files/69594979872.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/piposipanu.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708ef5ad763---jibinorazuzakuperup.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/faperuwej.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf921844936---95438232950.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/27899775549.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c5ff6295b---fawosodewigarujiwugon.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a10a286dc---dizavo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c169b5de38---24642369201.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/40769603313.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc52b7e099f---moduwudusinomuramut.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9344a1fa05850a4ff5dee24bb894c6b3/teduromaligajowiki.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e1a4ca877---zizapisufuxatexibutufuva.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/03cfe0e46e295d8dccb2c46763b072b1/zutipiwem.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/molozuzanogejow.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a559e71d7---73644735565.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/zijafipopovewiruwu.pdfIn PDF document text
    • https://superchills.com/userfiles/file/dewilo.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/lmnk2ubsffsg8f7svoa7tegg92/22308912281.pdfIn PDF document text
    • http://cycling-software.com/files/file/81772190697.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931af126e0f---bedodirinog.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/33833977830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=eating+sunflower+seeds+good+or+badPDF 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_off0000e9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E5 16932 bytes
SHA-256: 5a63b993fe77ba49d905c2a03deb249781a5b3e3972d5645a51819f74146e291
font_01_sfnt_off00011618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11618 10840 bytes
SHA-256: 70505323912e44789e0331467e6533f536fa306e827eab1f1f059a48a49bb562
font_02_sfnt_off00012f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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