Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb811827906e36db…

MALICIOUS

PDF

90.0 KB Created: 2021-07-17 03:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdf9d83c822bb626ce309f98608ec5ec SHA-1: b41672feab6df238cfb877ccf035d1fd209afe58 SHA-256: bb811827906e36dbc553992c334c5af7ad3560abd1a8ceadc72877e71e321369
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of an advance-fee scam, using lures related to lotteries, prizes, or parcel deliveries to trick users. It contains numerous links, many pointing to compromised CMS upload storage, suggesting an attempt to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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 https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/7544c53d80bbbdf85f06fda49504a42b/pinipibovarafiso.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b47dedcd275---wakuwabibufowitanivo.pdf
    • http://enricobarraco.com/files/lojoniwile.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160740ef2e4f25---21749083257.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/9a6b92bd4229b92666057f50bf821c23/15940818660.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f05f71d73---77162882966.pdf
    • http://artecgroupservices.com/imagenes/file/gawuzawavobagugexidatu.pdf
    • http://phunggia.biz/userfiles/file/95069721565.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c8b886f35---jejivugedulome.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081021be0eba---dusokil.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609751d0907ee---88500153098.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/3514af6a871d55f0426487260de159ae/peruwelemorufegezezawek.pdf
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/q3psajs8o90fguktlrk7h50efl/febisuwerupadixometirexul.pdf
    • http://villapellegrino.it/userfiles/files/jopufiwufitu.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809813e9924---36082963851.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160945ec8bf2c3---69548948406.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feca23562d---84226702236.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3bea0fa3e---71511989255.pdf
    • https://topupdana.com/contents//files/53520133471.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16077ccdc823b1---vazozagafomobakuja.pdf
    • https://emilline.dk/ckfinder/userfiles/files/xavikobuvibubaxan.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee334728c6---wolejod.pdf
    • https://godahoian.com/app/webroot/upload/files/32570487102.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+find+dividends+per+share+on+balance+sheet
    • 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_off0000fab8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB8 16792 bytes
font_01_sfnt_off000112ca.bin
cd92963a0a04f18aebbf0d161723a7eec5f3c6cfaf3e942d150104e9b11e7295
pdf-font-stream PDF embedded font (sfnt) at offset 0x112CA 17604 bytes
font_02_sfnt_off0001411f.bin
d76cbd307ac7ad1af0e3fdcef146af03f68cf860ada8056213a244a19fad1b3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1411F 11000 bytes