Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bc842288288556…

MALICIOUS

PDF

88.2 KB Created: 2021-07-02 06:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43b567cf2968177e1512d4145587bff8 SHA-1: 1da3f1bc7b3dd652ef8b5f36aba0a3389830d966 SHA-256: c1bc842288288556de49afd960cbf417226e13789fcb075ce6d03d8a9e42e65e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. Additionally, multiple heuristics indicate the presence of a link farm pointing to various domains, some of which are hosted on compromised WordPress sites. These factors strongly suggest the PDF is designed to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://memphiscentral1969.com/clients/865565/File/kulaf.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d8c206eb6---84808248559.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/22c4b30e0e21f5a89e641396cada186c/93698621203.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6f430b2bd71043292e708bea26534395/tosinujusovuzepokemifil.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/6645311f477d367efade677fb79b0f5f/korixaxetefe.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/635df3d77c6db362be4752d0b85107aa/51106236939.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/38f4554d133bb15537a288bcf1bd3d92/13491823180.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/c0c133ae6d602a9b677047155d7abdfe/dobosisotisavo.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/zesazawosajagigugasogasax.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/udhr95cdm10mncgo8nu25g30d7/18626792042.pdf
    • http://mackyz7automotive.com/js/upload/files/82624305865.pdf
    • http://ronaldtan.nl/images/photo/rimasanamipavobepomogir.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/fkq7qt8heujnfeisa7lb6m0t8g/begalod.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae33566caf---58480444403.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/b9num3otfb094pukn9afamed06/moperojesuper.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/nn2sai1md4j307mqe8c7jho9i2/20940125087.pdf
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/winakuwuwo.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/db83c4020b9fe0fe1212faf8b04f57a6/tajol.pdf
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81260016394.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4524cf13c---62769909752.pdf
    • http://altinay-law.com/images/file/bekapovenidamapezeb.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/545a43a8db3965ae3efa1ceb9c8021e9/37256420485.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0bc02ea68---sawepokegud.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609163b12c134---56041094456.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=things+to+do+on+a+rainy+day
    • 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_off0000f64f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF64F 16792 bytes
font_01_sfnt_off00010e66.bin
e9b3ca650f286fdeb65b7669dbe7a108eb2c4ab5fb8449455a2d13968e1410d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E66 10428 bytes
font_02_sfnt_off000125c0.bin
549ab9ced28cd354f1da0fa4d84fa17cdf6e23d1c395a27244f54a635055e6eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x125C0 17576 bytes