Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2f5e48e589ba3c…

MALICIOUS

PDF

87.4 KB Created: 2021-06-27 17:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f61e5c0cc3e3607762676733000fee2b SHA-1: 5debd2f5b2be27340d7c253cddcf2184f2a0ad6d SHA-256: df2f5e48e589ba3c03f11e84ab4a6b6840ac6a905ac179e308a2fcc64859ab91
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious and contains numerous embedded URLs. Several of these URLs point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The presence of these links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • 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.
  • 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://netiko.ge/img/Data/file/fanidoj.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ee9e0f8e5ba8b287087928b98a17e801/lesudopewuvukilebawa.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b424e99e9d0---fuwonigobipubulugugapope.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3c143b9ea---94543297908.pdf
    • http://hydrem.ru/images/file/81835237579.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/f98055e8ea1f57c3557405c1abda3e34/mutoguzogunusatawopurufu.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ul02acah8h7isrp6ev16kqadtv/xizijomof.pdf
    • https://yepsell.com/userfiles/files/palumi.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960ab702af3---molifexowiweb.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a363d1cf22---42532246481.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/fodivupexawuvurul.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66e1a039c8---bewif.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d01a5839---fabavunakazedigubuk.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6a363670285357569edacfb2f45dd4af/70601197917.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/b6e9tn5lhdoat6cpjkugi6d5uf/53107719522.pdf
    • https://webmenuplus.com/images/file/31802076787.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/aa16bfa6a63fbe5b725e45954ffc81e4/29928402482.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/fhbv5h1vlo9a7jpc11upvlua1f/giribineriwemupuzikavuduz.pdf
    • http://yakutiaprime.ru/SITE/files/editor/file/46562711727.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/9m5t00pbj14edn6tja72jagfv3/53225356345.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160857d895b82d---mivafijafuvuru.pdf
    • https://giolog.biz/images/bulk_images/files/ritisaxevusavabowotexivi.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef2429034f---29613947069.pdf
    • http://nineslash.com/user_file/file/36656849745.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073c5531aa91---33387142681.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/49ce212a05af74b2936ac6c3a991a0a3/92106969778.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=interquartile+range+from+cumulative+frequency+graph
    • 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_off0000ea91.bin
80fb01c0fd34697f13a6da651d3a61d01c9a697db9c13612bcbdd44315e9d7f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 11136 bytes
font_01_sfnt_off00010419.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10419 16792 bytes
font_02_sfnt_off00011c2b.bin
ff076ab3f7636f9d781e207afd490e32d7f272372c638857a7415001c63a2d95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2B 20160 bytes

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