Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c1784170100e3f…

MALICIOUS

PDF

94.7 KB Created: 2021-08-26 03:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 659b1df7f39ebde2510760c45b8a24a4 SHA-1: 0e83b52675bb1c0860eae2f8ae722f0c19339f3f SHA-256: 15c1784170100e3f3675004224b24ac6bcc2d0b2f66245ef3819c0874911a8b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains language suggesting an invoice or payment lure, and it hosts a link farm pointing to compromised CMS upload storage and disposable hosting. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious URLs, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ekachaiguitarist.com/ckfinder/userfiles/files/nigojojodeve.pdf In PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/f1ee1bf52a4105d1d46227008d035d85/35577801238.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38547014304.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/qfqoir8168gd806vujkdadd05j/kurun.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/sazawakavazosuroveti.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/zagularunere.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/wuvunem.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/gixalan.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fb20da36a---41196910490.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa6abd0d8---bimezebakufafivafipita.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161193eb348b94---nirakovusurixa.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/riteximavap.pdfIn PDF document text
    • https://irantruck.ir/data/file/65038532433.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/6488571022.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210811134625784936706.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ui9u3omtr4fes8odnoap11vktg/23564210985.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/a31b6da67a4ac0226ab77a47d04ed178/gurifazug.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080cf64e683d---87607921923.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/katoxarabixaki.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b48bbc63f4e---78744164542.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4bae7ff7736766d8315ada8c888ea0c8/68774430955.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/34336944867.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/20437335861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=why+do+you+study+english+answerPDF 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_off00010b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B45 10820 bytes
SHA-256: 192acb5af39687dfd6d9ef60b55f0b1e1e750459968cb5b50a8eeb9d8d82d979
font_01_sfnt_off0001240b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240B 17576 bytes
SHA-256: 703d07981a5745a72e0462b1a46ed1f0ec20daca177051f544af268f20b8c3e4
font_02_sfnt_off0001525e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1525E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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