Malicious PDF — malware analysis report

Static analysis result for SHA-256 53205705b7caef05…

MALICIOUS

PDF

100.9 KB Created: 2021-07-25 05:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64810192d738df497325a074b693a482 SHA-1: 5a9391929dcfa150a40c61b47c44aaab9fbc9cc2 SHA-256: 53205705b7caef05accadc553a24f4f71d4e50665ade5b2c31f3101690def21a
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while numerous, do not appear to directly execute code but rather redirect to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 6

  • 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.
  • 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://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160805a293991b---211856644.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607214be3fd13---30074389008.pdf
    • https://mamo-tato.ro/userfiles/file/misevewevanu.pdf
    • https://myphi.biz/nbloom/fckuploads/file/joxoxij.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/908c03e909f9fc57d1eefab60401beab/napomufoposanovisame.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/14c5490c3c53e3f7623f948af2307e40/71005800775.pdf
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/widegew.pdf
    • http://tencanpowder.com/d/files/53272201498.pdf
    • https://clubsportedinburgh.org/userfiles/files/zakedexebeweketujute.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/79408411406.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b7fa084fd---rixugukidenewedaxo.pdf
    • http://woorymart.com/userData/board/file/kebekeluvufeme.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/be2cb4139c2f734ff4fb6bc92ba59329/denibovudukedoxawivage.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4d79f3a97---45256925228.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac166e5e6a4---vujevorififilafat.pdf
    • http://sevinctekstil.com/resimler/files/97641062232.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160969bcbf201d---33714936200.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/ehkhhq568ah825f1afsk0c87lt/nufenesanovuleget.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a75e3e4e69f---lowosaki.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/12432319478.pdf
    • http://poslovniimenik.net/firme_data/files/75690403952.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16085b56308ba6---vejumoxoduku.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/u3laikg4d6moe8bojc7ghlppm7/lujuta.pdf
    • http://alemotta.com/resources/original/file/nugijonosigegipavomosog.pdf
    • https://bulgariapools.com/contents//files/lolujesulupemonejorogi.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/f53de6b4c0b7fd813a66cf3f4003141e/puxene.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6da7ec5cbd---18034682867.pdf
    • http://screen.by/images/file/5618176244.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=la+ley+del+espejo+libro+gratis
    • 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_off00011bb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 16792 bytes
font_01_sfnt_off000133cb.bin
e94926534a9e4ca81c1d05bb60bc1022f9478fb703af811bd7590fe41c7a3ae3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133CB 10804 bytes
font_02_sfnt_off00014c56.bin
5e9de838e7c93d1a5eeac8a06387e474c1a252c542e5e5e420ea4942c9d6bb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C56 21792 bytes

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