Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b55d49878b901fe…

MALICIOUS

PDF

87.6 KB Created: 2021-08-25 13:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6d7cca6e01eea2bdc6ad405b6c49d050 SHA-1: 9167f51b09e8ce8a0320a624fe91509429933c8c SHA-256: 5b55d49878b901fe4551f4475ab692ac522c97ab87fa4d16e9524a1d785a36a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Analysis reveals it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. This suggests the document is intended to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://schokozentrale.de/idata/34850695537.pdf In PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b833ce830---pipuzalepazuru.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/79636442675.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/gudevodezosekewo.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4061b5ab7e4b1d7d16d6029fe32670c3/vevorunid.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/52021914101.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/74670964526.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/49465166189.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/ramekutuvaxanuku.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/45003363412.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/70421069912.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610d9a312a12f---69583797734.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9dce1b94e---xakapuzelakapekemujuliv.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16089be658c4fa---mewomotazobolepu.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/gibizafarapezuwigifasum.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/63d339881d14f293b31de8ce125f729c/bixenufop.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/lagevizeferaniguxutenoxe.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/12665491534.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160852f2b2fcf0---66784047193.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f156f9fc23---15216684170.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607198e043520---pupigojalegarema.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/torinez.pdfIn PDF document text
    • http://kco.su/userfiles/file/7209581418.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/5d48f1acb39ef6695d85bdf55d94b615/74350083769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=look+your+best+meaningPDF 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_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 10808 bytes
SHA-256: 176c28f047f055579b14899249749cd58fbf71382936458030d28e8299b39604
font_01_sfnt_off00010e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E46 16276 bytes
SHA-256: 474930f8c479b20310d8c63ff2ccd626d83b4a8e1cb48f0e94163da4d6271ede
font_02_sfnt_off00013886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1