Malicious PDF — malware analysis report

Static analysis result for SHA-256 d164d9d202b55100…

MALICIOUS

PDF

87.6 KB Created: 2021-07-02 17:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19f860c877bcba1990606c0b086e7904 SHA-1: 38646f98b2676074ebf68dccc1ba85114563c8fb SHA-256: d164d9d202b55100ba2c15362b3f06bc00acc57c3873a1d8399e417113af0cfb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to further malicious content or phishing pages, attempting to trick users into downloading additional malware or revealing sensitive information. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://krisoc.ru/uplcv?utm_term=pdf+to+word+no+email+required
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/e33ebe8a242d9d9e58325da0847c2e0a/gomekikeroxewe.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2453adfd46---5177768026.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/95771611a31ee1c5f4a0cfa27466d716/69801752428.pdf
    • https://dolmalatrek.com/userfiles/file/69660477236.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/41bd377c51ae7f2fb7c4df5795012cb6/bibutomogimixezafekij.pdf
    • http://ruilong-ironwork.com/CKEdit/upload/files/44317717102.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/5f4b67663ab89c6a91c75dd9679e2223/4977829056.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077683096d37---32480115581.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608494447b75e---lumawufoziluganami.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8d18f48d7061da2093bb2595ed65a2e2/58794412477.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608576f1ae9c4---simejesuma.pdf
    • https://pharma-tools.eu/galeria/file/33456981274.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92a5e82329---23146240824.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2d650e40a---fujebofemebov.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9602ef527---96914028098.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094da22f188c---napiwulabofedupafagodux.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/30030378859.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/9d703109c881377eb4cac89da93f044d/88907209765.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c44b77559---59420107432.pdf
    • http://littlepearlbooks.in/data/eimages/file/21411464739.pdf
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/81296004529.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/okq1d5airc2fa1oem3td8mda60/kiwexad.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/75aea5e41603348caf4a78b6a647a87a/xaweki.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da55.bin
9a8bcb22e86cc2a349124ce01cf73c5c439104736d924975f7f97076cc003dcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA55 17768 bytes
font_01_sfnt_off00010934.bin
4b609e1740bd12852bafdea1b7c24b7ec83de35c579b01558fda54f154bb8e60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10934 10680 bytes
font_02_sfnt_off0001217c.bin
5cfa37fce0989fcd98349beccf9a63719aff29e66b00f3ba655f54b68a91f5d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1217C 16120 bytes
font_03_sfnt_off000136cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136CF 16792 bytes

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