Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83c290f94d31959…

MALICIOUS

PDF

85.1 KB Created: 2021-07-02 00:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d928b5c0eb37b9135aa480ac4253618b SHA-1: 04390e782517c3aaaacd2d36add1f21d1568552e SHA-256: f83c290f94d3195902ae285614a1899d17bd6e217547e6ae9daa36acc04c1118
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs hosted on compromised WordPress sites and other disposable domains. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160de227896799---68360993253.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/2mvtirnuggjjrrs0mqe42rcsei/xejejapafexatuwej.pdf
    • https://burstallconrad.com/editor_files/file/32128336836.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/67bibp4nudrloq1csmq55ph4tv/gerawasamawojesoveboni.pdf
    • http://ahcxdq.com/uploads/file/260423154533.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4715eb29c2---sojogi.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/19c1511394e9887ce9f4243d2bac6802/77344865208.pdf
    • http://murasakijr.com/uploads/files/10200731142.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a285c8f3b76---zitetugiloruwasepasatimaz.pdf
    • http://refpecsbelvaros.hu/kepek/files/87686737322.pdf
    • http://dermalab.pl/userfiles/file/rurajelukazarivatojut.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa8d648c03---togupanemawusojera.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd89201b4c2---36935130657.pdf
    • http://ersatzmonitor.de/userfiles/file/vinupukikifaxumipe.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/3d01f91f7c7a647c3a4a20969b483a1f/mibuz.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb1c772c27---31159645936.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/e5099f397f220f150c29c099d2dd4af4/gerelokusewopal.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/9ab8adf355caece12b7e0e90b4044746/woximozokepupeguto.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab21625ec0---jibodu.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5766fde05b---nebilujulavejeza.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b000f96b909190e84555cea2c72e75b6/jezetuwipimoruvefubabe.pdf
    • http://meteosputnik.ru/userfiles/file/34070311372.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd0587c91751943eacc322f372ed74bf/76473314398.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=biopsy+people+also+search+for
    • 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_off0000ecdb.bin
12e58a193ef112881d30266e895a59750f672e77eb8ced3d8ceb86b5c6d9140e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECDB 10540 bytes
font_01_sfnt_off0001050a.bin
01b3b4da50ac99e559e8e832484ddcbb154c80f974b0dba230d40412c8e3f03d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1050A 16340 bytes
font_02_sfnt_off00012f23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F23 16792 bytes

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