Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18800bf71410799…

MALICIOUS

PDF

89.1 KB Created: 2021-08-03 17:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 91a39ef6c5187314fad20db9bcbad33b SHA-1: 8f0c8b0ea9111d90c47e02e8489a8f715ebe3940 SHA-256: a18800bf7141079995a21385ebaeb2fc225bf98b653c967cf395a14b4eddb0a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the PDF structure indicate it's likely designed to exploit vulnerabilities or deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://toeicspeaking.net/_UploadFile/Images/file/9727542607.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086d04470299---dekuwewuw.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/lagimumabibuzuxanozofo.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c85da9ef810---59243168323.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/tafarevilusutogijetoteluv.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/dilonijilepilebi.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e2c4e95e1---48573320755.pdfIn PDF document text
    • http://chpcentre.com/files/file/30532141833.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/25765139476.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d449e64dca7---tiwelujufaxe.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9aef882ef---10584135832.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717be3cef47---6501691245.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107101209371830.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/mituzezuzunanopuluwu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608af1c6a430f---lopareruzud.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/5045035519.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607592aeefb9d---femiterabibixukogi.pdfIn PDF document text
    • http://samtekelektrik.com/files/616045847.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/g6vc2bh55ocpvojam8huiah81j/70402473666.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/37507374003.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/vinorizitugi.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/dc6db61672fb9cb5a70a0dc0187f2702/liravowonozodubegumolofe.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/14168863274.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df2a738b5e3---8140092588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=n3ds+emulator+download+iosPDF 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_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 10744 bytes
SHA-256: 815d037672864b156d0ccde34d7cdf0c40c2bdd040ae3b269c7e0adec2303029
font_01_sfnt_off000112df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DF 16776 bytes
SHA-256: 6e52d4ed71568e1cc24fdde2bfff67763758df0fe0875f7ab2b80f9f0fd2304e
font_02_sfnt_off00013e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1