Malicious PDF — malware analysis report

Static analysis result for SHA-256 7178866ef878f17e…

MALICIOUS

PDF

80.9 KB Created: 2021-10-05 07:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00130a755415b5b699187a21f87b8367 SHA-1: 7985bc11b04aff7b79ca29670a08ef31825da022 SHA-256: 7178866ef878f17e6733fe6cc724fdaaae6d1870b10a8f05446b1bd0b39449d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ML classifiers and ClamAV. It functions as a link farm, directing users to numerous external URLs hosted on various domains, many of which appear to be compromised or disposable. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true destination or leverage compromised infrastructure. The primary attack pattern involves directing users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synerhu.ru/uplcv?utm_term=growth+hormone+acromegaly PDF link annotation
    • http://mgtofubbq.com/uploads/files/minekinofupodaduburefu.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021092911242873499.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/tuvalugedikuvuf.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/28933069084.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/42622241566.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156b72565767---maberimep.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/15210604189.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/75986203985.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/62pfmt6d4sf3k0c1h2am8r1gb5/pijedusoxe.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/mavedakabesugavu.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/menukodeputuwopelalun.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/47579761721.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/wojogu.pdfIn PDF document text
    • http://jarosi.hu/files/file/47802250423.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/jajefifumadab.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/81567367097.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136fa60e31e4---panumawiwi.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/tiwofoxepa.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/46716719896.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/93547278871.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/fesexaxomufularevov.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/xedidox.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/xemiwugulozenoruwewo.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/61970303867.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210924_EF36A06C4C1A1EF2.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_off0000d221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD221 19420 bytes
SHA-256: b3333401fc448dcea3fbf16007f87f841b43b4baf59854c35de73bf9aa93e04e
font_01_sfnt_off0001056f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 10656 bytes
SHA-256: d1d763d7ca7500a6be1034fed193843ece8c6303348afa22be6b7e54fbe68ddf
font_02_sfnt_off00011dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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