Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae124b42f2d6056…

MALICIOUS

PDF

73.8 KB Created: 2021-09-01 16:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fcd013938758fc482558a99d390cd321 SHA-1: 99fdf5b253efceae6ed67f7d93acbe01045113c7 SHA-256: 6ae124b42f2d6056485afdc33b33f04c63ae437bd4b207c02c1fc1543079afb3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest it's designed to exploit user interaction to navigate to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe36a043625---68545300439.pdf In PDF document text
    • https://muratay.nl/userfiles/file/fifojotutoxosuropanamogaw.pdfIn PDF document text
    • https://serka.com/serka/upload/files/xekidaxofolumisuzikazelu.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/59073653988.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a0d64644a5b6de5cec4d6b656134ebcd/ruxavudibufonozuvalidudew.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddafe96cb5---55372974846.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/80019312363.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c8faf53296a---60885387305.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/fkr4c42alhjust8jm6tb47pkt5/61590270394.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/05b691b632f1d6954bbabda1e1c85b71/69588220351.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/47326753225.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/92770738677.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/76794035151.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/9sm5a23m2nhnroskdvrarettg7/14496635682.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/ronabokixikulifawova.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/12b5bac947bae0d690a18f239b71c040/delomebepe.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097be88c6d1e---nikovupexevalugigekumajaw.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/82423002343.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/13080982624.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f638e260c---wedapufukipigenibekij.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c22b90489cd---mukasaxu.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/zeditusatexemelubufe.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2ca957a2e---78755455831.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a52487d559c7a7393f63b1900b2291e/84845526042.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/7gdgffv836q5it5eenk4a845ao/tubewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sails+on+a+boatPDF 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
stream_005_off0000ef0c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEF0C 16620 bytes
SHA-256: b619654d58310886e0a352e7a8a2942c3807ee05dc1c80a42cebead0332e9ac5
font_00_sfnt_off0000c06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06F 10084 bytes
SHA-256: 8e67c5f71386c7a01ba3a7651449a75b3329020cbb7298cbcf8ffc6507b6a365
font_01_sfnt_off0000d6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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