Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd40dea39433c89…

MALICIOUS

PDF

91.7 KB Created: 2021-07-07 18:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dbe2da11fadd15dfd347d2ad25824410 SHA-1: d2beaf70b594c46beceb944a0b4668242477c974 SHA-256: dcd40dea39433c8929fbbe72db034f2c7d6bf7112ef5592f217a05a9d964c8c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://pixomot.ru/uplcv?utm_term=planta+keep+your+plants+alive PDF link annotation
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/8ae4ee8f0becd54e47f3860860a1d172/tudufego.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c065e8173c1---85980385279.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fab9589f8---kepaxebadis.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021618657338286.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4c6c76544---jikixunofuwosa.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/602b08164e8efdb1ca97c60f613bfa05/sumowu.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/86602937125.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/fenebixulup.pdfIn PDF document text
    • http://siembra.me/uploads/files/70068520552.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/oiud3rffoc3e3l42poj5uqdec4/84620758628.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/50aa328c52dbe42a4acb479b2b1ec039/16433361554.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/51865dbc4f511d7e68b140d28e87acba/50167590893.pdfIn PDF document text
    • https://maturana.cl/upload/file/gojugerupogezibefanapoj.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/64297734575.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/pevejijaxi.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede77d6b10---figinoka.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/xigid.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9bece30e8---xofevusujaxarenavuwaku.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/7shno4lrfamsp7chab5h1lnjhc/3182803767.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/u1tkuugs91u2tvo85n46p41aj4/55414858055.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607475c8e6dd1---54538617597.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a9078018b34---tesobolaror.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/drq3vdl3dhhpbgs9j0tjhj7e8s/poduziluxibofipowavokenuj.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10338 17580 bytes
SHA-256: a49722b66c8bb5aa3f77cf8b18bbda31956859e8ebbf10bc7eaaf5ceeeebcd48
font_01_sfnt_off00013125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13125 10616 bytes
SHA-256: ae2d389cfd90b852b68034092a1b6cee1a677419376baef140b3bfd96b9a4a45
font_02_sfnt_off0001499a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1499A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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