Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a24aa027a934b5…

MALICIOUS

PDF

84.9 KB Created: 2021-09-19 17:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 96b4ec8883b7ebea5535238d59ce8824 SHA-1: ff9e0d41acb966168706c876fdf16d086f8f3c3c SHA-256: f1a24aa027a934b5467ab91294b83547cf812e0b559d165fa42615d3077c0101
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are indicative of a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://swotaweb.com/img/upload/file/56516572110.pdf In PDF document text
    • http://metallpress.ru/files/94135495916.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/gowage.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/771c40ae0fbfb81f297b263391f506ca/faduv.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ca80b8c9bd91ae472e049a1f4cb22edd/66517337679.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/01/file/20210901_175108_195.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/35277284819.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/xarixoxebutekiradatoto.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/bakanomanab.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/vikejo.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/78072211275.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/wogaxitu.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/32228766762.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/sunikemekovemizatoli.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/60963040405.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/3639789765.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/pizisekinokulopuriguli.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/xililukaxapatise.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/22535212147.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/rivejonugi.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/97222078443.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/kufaxabudi.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/82343299882.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/6096014529.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/materavek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pmbok+guide+downloadPDF 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_off0000e789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 10644 bytes
SHA-256: 8d143de0d94bd9c37322ddd44b8438470586b876beb2932af99516949e5543c0
font_01_sfnt_off0000ffa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 17980 bytes
SHA-256: 62343e8f14962d81097a0c984ae822d84ea0d6964cb1fcde607766b35162839d
font_02_sfnt_off00012e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1