Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45e8974cf3c4001…

MALICIOUS

PDF

76.3 KB Created: 2021-08-11 07:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e49bfd1374fb899b6f5151026fe1bf77 SHA-1: 7933498270e1de623583ee4a6592f51616eae7d8 SHA-256: b45e8974cf3c40017240093277fdaf4592a05e2fa24d31c640d2518e5b0dcf3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and other domains, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://wastran.ru/uplcv?utm_term=imagine+dragons+night+visions+album+download+deviantart PDF link annotation
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/67a4efdbe871d2da4cf64656e933da7a/70802540665.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/tuvumotom.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/nalixixev.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/5db48d249256f857b744feb1bed37571/kefenimatirofivu.pdfIn PDF document text
    • https://telorgabus.com/contents//files/dubakase.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/xobufakelivizaramutadug.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/12142789205.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d553e3509d3---duxoxidok.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/bodilapotegidedenigoman.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210602165154_642807328.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8a6612f49---16689856394.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/6jk5ecg1mmi5u5rvk8kvagju51/61874270695.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/960f2c3c05213511e7e78a7673c624a6/gipedawebajapiwomodinux.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef4d9152ef---79467805467.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d00908a9b---pebaburipegixabajagefusur.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/buwubeberaraxedupuduva.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/surojizititi.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/vagokebevaw.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087051796ac9---vizufumozezonumovuvol.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160979ad02ad4a---lezalanepumuzinep.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/qe8o695hu1n3kci3cnmd59o374/xidezitetosabepo.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608808eaddef2---liriget.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/88cbc9c1658aa66d19ccd36c56ca8883/fetesikap.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/saxodaloto.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/1csgplldfn06vnfluopvqrg66p/wovurutuwewutetij.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/texegadagixapexotivisal.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_off0000c782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF94 16284 bytes
SHA-256: 546d27c65988e79ed95a7020b502618bf5b17340ce68be164e8f2d494ffdf794
font_02_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 11040 bytes
SHA-256: 4c6ead91a8c7eea78311e15f5c2c207f634a6944327f618565b4c8d472e2239a

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