Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8ee2d258b391e4…

MALICIOUS

PDF

100.8 KB Created: 2021-06-26 08:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4910a9bd97f645dd823df5e920f1f741 SHA-1: 7033d8557cfc5b808d9700781741e8385e3d9d0d SHA-256: fc8ee2d258b391e404738acae32457286215b48ead0f7202d21b2754e2c993c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further malware or engage in phishing. Although no scripts were directly extracted, the structure and URL findings point to a malicious document distribution workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7723b958f4f79963c1ffe88f8ef2372e/wexovujadizapatamopamax.pdf
    • http://afgventuregroup.com/cfiles/file/bosinezubudisobofafixak.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160998028db4fd---fugopamobeledowerid.pdf
    • http://schokobrunnen.com/idata/90372623286.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d34429c2a---98328207308.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/30c841af2a8ff8c7e60865a90cfe1ff2/21635280222.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eab0155182---77972585900.pdf
    • http://anhbanglaw.com/userfiles/file/11306638411.pdf
    • http://cappellastudio.it/userfiles/files/xekuxoritud.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e54c3870c6---20492773591.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/s0q1rli67rg152bk4h943n50r7/53924605980.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160710a193708b---kukatonugejotu.pdf
    • https://stijsr.com/userfiles/file/15505251224.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2162cea8ab---jetifijaxopatixunaji.pdf
    • http://brainbond.ro/userfiles/file/86212761595.pdf
    • http://espacioschillout.es/images/admin/file/22217899244.pdf
    • https://jahanchart.ir/data/files/file/zawinuxezedebakur.pdf
    • http://www.alfapilates.pl/upload/file/46613712990.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bb93de3f9---42133242292.pdf
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/s40hukf9f3gvod16lknvivaigo/domoxoxikalogozobukef.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/opootih0icjs27ob2h142k0362/29956189442.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a38b2a5afb900ea6656910e41f25452/dedusuwagaxiwabemorej.pdf
    • https://lotte-ppta.com/beta/assets/file/43473087737.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/41c8525aead73be87dd6cc1f8a658bd2/pexowazepuf.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/37f63c70eaec697a3671f3bbbe87a35f/sejavasidixejalabiwodole.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4cc3d8a1d---diwomomupijiroduwikukom.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb7c9d6374---fisafoji.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=made+easy+gate+notes+for+civil+engineering
    • 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_off000125fd.bin
98d345ed46f32498691b251e25e3c8f1e560727fbd6152e2e2a67222f6acb4b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125FD 17696 bytes
font_01_sfnt_off00015482.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15482 16792 bytes
font_02_sfnt_off00016c99.bin
e76d5a4b9f2c8e545d236100bb51f18cd1e03c3934487bee0d702dfdd451da0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16C99 10824 bytes

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