Malicious PDF — malware analysis report

Static analysis result for SHA-256 255ab8bf985efb97…

MALICIOUS

PDF

78.9 KB Created: 2021-09-06 18:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: be101ee88034187f49272fd02970885f SHA-1: a9a093794153edce9e3ca63d66dae10a0f879361 SHA-256: 255ab8bf985efb97e5bc6af3e236611c94657af4c5d6a4d404e77634c6079493
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6b24b34c0---dodetajojixugalu.pdf In PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16121d20ae1e73---41641756212.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/puvixunipuriv.pdfIn PDF document text
    • https://wecareprogram.org/images/file/56256432952.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e2b812644---42576118477.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/gavujexevar.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/p414204iaf20s6eqdttvgedau2/jifuzago.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/58504938758.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/c4a9b52c875da1a009b40f1686746e86/dovomomeravukuxolus.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/zuxawewoxaxatozewes.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8cdb1e67c---64058433242.pdfIn PDF document text
    • http://mesterek.net/tmp/93290523477.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/0af46364bb9349766a92b5b30d722c07/7457734337.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608422ca977b0---24933655238.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/podipevubasibudujebifa.pdfIn PDF document text
    • https://mauspro.net/upload/files/74506808750.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/lorivu.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ob8jc5hd6shaic8bnurgsf6kil/dumesidexuzibasuzabunujis.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daf51af06cf---40118716219.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/73857795194.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/c38c10a762f7075f2d9d2ac6c456737f/ditazopis.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/femanatulupoledazoka.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/simoke.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0e726e573---tirukiletojozitolep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=morfologia+trypanosoma+cruzi+pdfPDF 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_off0000cecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECB 17572 bytes
SHA-256: 94fc3a34d347f4f2cb2487f92e6ec0dd5481473293ba6b32cb866e255a0a5f3b
font_01_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 11100 bytes
SHA-256: c545c053fc41ab241bacf6684b88e1e102491763dec32e97b53f5ad674757a45
font_02_sfnt_off00011594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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