Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6184a0b5af95e9a…

MALICIOUS

PDF

75.3 KB Created: 2021-09-17 16:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f09c1bcb9312023dbb0c53cc297f85d SHA-1: 24812643d48ffb9eb27809d72e0c8d46e4639263 SHA-256: a6184a0b5af95e9a74b96b14ab975bc97de954d9ac3e31a255eda20b960e35d9
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ozmutludokum.com/userfiles/file/divetiporowegatopum.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613422c83d76e---vifamowixukis.pdf
    • http://abw10thstreetne.com/uploads/files/59030769040.pdf
    • https://rajatotogroup1.com/contents/files/tujesenezafavemulunugore.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614479658a886---vaniluzipapidagumaju.pdf
    • https://nffcd.org/userfiles/files/37228769301.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138da27db81c---73104345398.pdf
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/59605590278.pdf
    • https://artesapanaderia.xyz/aym_image/files/39678161429.pdf
    • http://vibrobreaker.com/files/files/donaxoworaxinegobakixix.pdf
    • https://divetechmarine.com/contents/files/kitolad.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4bcd340e0d3d3b6e586134d8889ebe8a/soraruxuwelapibip.pdf
    • https://gres-k.cat/userfiles/file/tojufakuw.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/sovupinerane.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/255c4b0c0ac1617b482b8de175f814ab/35045952421.pdf
    • https://hotelangela.hu/userfiles/file/23242671635.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614375810cdf2---75155794116.pdf
    • http://gsxr.hu/userfiles/file/96930490777.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161432b2b64085---guwesija.pdf
    • https://konzolstudio.ro/uploaded_files/file/88924729626.pdf
    • http://www.likoda.com.tw/upload/ckimg/files/84881545665.pdf
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/nudefupewojisolazaridifu.pdf
    • https://www.delaneyllc.com/ckfinder/userfiles/files/junamemuj.pdf
    • http://dribblebar.pl/userfiles/file/wewevekitu.pdf
    • http://imotrading.com/images/userfiles/72645960504.pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/67372794364.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=geordie+shore+season+9+episode+5
    • 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_off0000c218.bin
c3f8f4df8c744e272bd9f32e644823c601f5f078501a563e10a4d63615a59320
pdf-font-stream PDF embedded font (sfnt) at offset 0xC218 17236 bytes
font_01_sfnt_off0000eecc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 16792 bytes
font_02_sfnt_off000106e3.bin
b7a774bbbac867cb327076cb4920a66e90136814fef8eef57ca16f9b1f3707f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x106E3 10684 bytes