Malicious PDF — malware analysis report

Static analysis result for SHA-256 076b6f5f3b2e85d3…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 06:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7052d288c616eae87f143545cdf408b9 SHA-1: 40bcc7aa8ad33f9519396a6b49d51c9e0f26fe9c SHA-256: 076b6f5f3b2e85d33dd9280ce43162a565d7454e554116d815ecc6262320500b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document 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 other disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs and the nature of the heuristics indicate the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://sloplast.com/userfiles/files/13710739423.pdf In PDF document text
    • http://sibstroiexp.ru/userfiles/file/4043732170.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/bufepotapovuliru.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/29353934698.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/44546688834.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/xiwesisagadenetekisupix.pdfIn PDF document text
    • http://podarox.ru/public/files/foxewi.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/sogagefugap.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/65499373991.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/79888875083.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/wiwimazezofivison.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/80822441682.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6hfeb6lv10922ap3pmgu8bape6/kijorekasobiwisarajo.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/59961436837.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/23438047541.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/kejimutopilekozolax.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339b7c1d906---44713384823.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/33345362072.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/19653859684.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/fedajebafinokala.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/gijidemaxuweka.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/vexizasuwagadadilud.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/tologelopunezum.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/72386877803.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/aac58fbe68ed0bcf37f1b6beab2a717b/jupariwuzupibonezajum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=roy+jones+jr+vs+mike+tyson+streamPDF 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_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 10672 bytes
SHA-256: 7d5ec81341b997411bdeeb95e6a2a266558494f37a77e1b7e4dd6ade4691127a
font_02_sfnt_off00011400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11400 18048 bytes
SHA-256: d757a05cd2aa3d9dcd9434ba2bf0120d3c6be8aa0d1a8cfdf8614f188ab77316