Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e24da4fbcf4e65…

MALICIOUS

PDF

68.5 KB Created: 2021-09-23 15:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8c24599650156f6be04b4c6e9675ff2c SHA-1: f5def4cb3e7b682053ba38a21f3cc31b545b163d SHA-256: 89e24da4fbcf4e6595c47dd8106f62a9f6c336cd7e9c2c42c5478f401d88c1f2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristics indicate it's an image-only document designed to trick users into clicking embedded links, which are numerous and point to various domains, some of which appear to be compromised CMS uploads. The document's structure and the nature of the embedded URLs suggest it's part of a campaign to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://nirmalapublicschoolerumely.com/userfiles/file/nowarasuxuginavelisax.pdf In PDF document text
    • http://tecnoservizi.com/userfiles/files/wevadajikijedatolaxesabu.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/4295244279.pdfIn PDF document text
    • http://nature-revive.org/files/file/zixus.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302efa01122---79335693567.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/94489077409.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/30820621195.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/7755240151.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/xopopinuvomupapasubone.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/bikusu.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/8348553092.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/58868438378.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/32892506377.pdfIn PDF document text
    • http://maulich.vn/attachment/files/fogiletasedanudilazo.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/4a73e4f9209509f496ea678ba2b17fd5/foramuxuvapizikefu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/edfd85928d85860fde354f89f44704c3/21019725995.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/pujironupokaxokinumokul.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/78978749427.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/59060268307.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109170218169600.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/purivevipasumudulezolixe.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/sinuz.pdfIn PDF document text
    • https://telenovella-bg.com/files/76342086746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=print+pdf+using+itextsharp+c%23PDF 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_off0000b02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02E 10936 bytes
SHA-256: 4cb7f7b122c68106ac730074b252b9306a09e9578ac5fb784eeb38cf27a8e9cd
font_01_sfnt_off0000c944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC944 14132 bytes
SHA-256: eb296a156911c03d52c0c24d393abcf45d96aa250a5eaf4e9fdc87395b13fbd1
font_02_sfnt_off0000ec6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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