Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dbb430c8fe15ba1…

MALICIOUS

PDF

85.7 KB Created: 2021-07-06 15:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94481528e91b0a600be64a940d5c23f6 SHA-1: be773171828a84cce4caf7d07a48b6f1cfefccbe SHA-256: 6dbb430c8fe15ba1faa2cc331e276d6f3951e333e2d40bead79f59b5eb93e608
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to host malicious files. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://eurogeographyjournal.eu/admin/fckfiles/file/51998343978.pdf
    • https://handinhand-daycare.com/ckfinder/userfiles/files/94292327412.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607778565d51b---55362096676.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1af8a5e376---18431091346.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/4d975dd7c30e8f33739cacba32cc12be/20237170261.pdf
    • https://luminex.pl/upload/file/muwobawagowubazibojojuwe.pdf
    • https://cairparavel.ro/app/webroot/files/userfiles/files/63591535577.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d0fb75940256a6574d9e4e1ecb691869/dafalamaf.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e919a35bf87f7c078fe6d803b3266fde/muviw.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b891f6cb119---63967229651.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23624e15d---volafobofefanasepotuvi.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a096bdc51f0---11836043271.pdf
    • https://serwisnawigacji.pl/userfiles/file/kunimanivew.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/1952709594.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/651f52d15bb6fae7644d628ae48c2a02/bezovopasivivevi.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160947d8d17a70---tumababawupavodekuju.pdf
    • http://ipceurope.com/assets/file/kimegewawedugudo.pdf
    • http://www.pics4us.de/userfiles/file/xesiteluvexu.pdf
    • https://hondamienbac.vn/userfiles/file/bepodakolawoze.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072302d3b98e---mijuraluzaboxigad.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/linogovoxonabigotiv.pdf
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/xarawiwip.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbbb7d625c---bimufirokizi.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714ee8de27e---73339600101.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=connecting+with+computer+science+2nd+edition+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e98b.bin
5a0544bdf32922c8e7f78bc34c985bfcc74bb4badf42bbea77f8e566874c5d1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE98B 17328 bytes
font_01_sfnt_off000116ba.bin
a3a6389b8d4e65b680ca447f7605b9ed9cd84ff4b156ed7f896454f02e75708e
pdf-font-stream PDF embedded font (sfnt) at offset 0x116BA 11252 bytes
font_02_sfnt_off000130e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130E3 16792 bytes