Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a87bd339ad7ba08…

MALICIOUS

PDF

99.3 KB Created: 2021-08-24 23:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f979cc96a0bf61884a916109d93669e6 SHA-1: ab68881e0dd74e7f34b06f1b6a4afb3bda342b72 SHA-256: 7a87bd339ad7ba08536accfe006c7e3b1fdedc6bfa7aa697b7ddb64452b0e86c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs suggest a phishing or malware distribution scheme, likely leveraging the 'link farm' technique to obscure the final malicious destination. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701471187d5---julug.pdf In PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814b1aefd3c---61208955842.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b043478dc54---51846258631.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/tozemamebemonapugovukigi.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/08e4799766b9ca02a61f4636e1ba1762/jekewujajin.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/84418b14ca56dc5be1e22b90c38e9ea6/xajoxedoko.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/36477897766.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e47d420c24e93c401ae6715365571fba/ranedowej.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/23606665026.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608284b691744---solotudoropemezirixebibam.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c96c92754---xifejaro.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16242273826171.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/zodulu.pdfIn PDF document text
    • http://htwy.com/upload/file/25042598991.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/78900687322.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/loburarex.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/91777824341.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/nenisefeluzek.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808bbea4108---72379526230.pdfIn PDF document text
    • https://renewone.de/files/39105650808.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0ac30521e---94891963306.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/81118944088.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/lafabimipavarotigotetow.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/rotatabusurajizegir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=autumn+in+my+heart+ep+4+eng+subPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/97a8d26bbade8105afdc59aa976b801d/77524806956.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_off0001211c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211C 10948 bytes
SHA-256: 78ff32828652bc43fe0ce149022a99c3e4d58af57a64c8834c96ff99b16c97d1
font_01_sfnt_off00013a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1B 17156 bytes
SHA-256: 68ae1f61c0bc9aad95d8e787a3c4792e9bb57ca9e658367e5f497d5f83a7f55d
font_02_sfnt_off00016675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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