Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a683c31b044467…

MALICIOUS

PDF

86.4 KB Created: 2021-09-01 09:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0d8f9a00721b72c2c85b81559483c16d SHA-1: fb17d0303a22a32f6a12a888a252fb450bf8a034 SHA-256: 77a683c31b044467857f40b7121e40fce9d8ed04f52ad62d045c52b4185662fd
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to manipulate search engine results or direct users to malicious content. The presence of urgency lures further supports a phishing or scam-related intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.motionmantra.com/userfiles/files/28679431481.pdf In PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/simegitamuxiv.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/logivitizam.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/lb2k9ter917qr7ueuqickk2kk4/92740223235.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/85737183442.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/jitedezakaduj.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/r8d2agn3snrjibpb71hk3emif6/rexagorubotuv.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/jomovabakokivemipap.pdfIn PDF document text
    • http://roocenter.ru/upload/file/lidurikepudanezu.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/2e412dda2f8eeca6ad0453a8b1ef4bab/weluvajekarezetitude.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/73771114696.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608a793d87388---27194002195.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e8771a002b22e6e5c2da3c782da9998c/41977718497.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/24268c3971ef2470e6fb42f07439179b/puvaxosan.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/busijifiresewez.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd919ab18b3---fapelivedobotiwebam.pdfIn PDF document text
    • https://vendax.ro/files/file/97365078674.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/6696806505.pdfIn PDF document text
    • http://plncse.hu/php_data/file/34312137673.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/8983b4ebb9d6b7c9ba7b3a3811f3a03f/9365232257.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c98c1a43601---sogixujawopozenejud.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/49724189932.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/wexabumoki.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/lelekaligigeguturijefe.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/likudisurosozewamowezu.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/38319986716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=middle+earth+shadow+of+mordor+tips+and+tricksPDF 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_off0000ec60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10477 11056 bytes
SHA-256: 1bb5e4837772f82bc4a81be47457645a9538e6ae70396cbc51e5fbe6572509ca
font_02_sfnt_off00011e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0C 17356 bytes
SHA-256: 506a282d32f7751ca169cde8b3f3d53a0286bcecba0aed9fc9196c4dcf07edf7