Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f8a53d76883682…

MALICIOUS

PDF

101.1 KB Created: 2021-07-07 11:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db5a3c3e4fe59ab714fd11b518c4fe64 SHA-1: fc18e11b260fd4ec8cff406be799b141af18b8b1 SHA-256: 65f8a53d768836824e363dd32fcded9e022cbd221913eed452500e675690f35b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of embedded URLs and the overall structure suggest an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160d37b354e3f0---nikawupujopomozapam.pdf In PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f706af6f216c69e4aace9241721420c5/16563263719.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/14078980576.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/gozaxudekiwolonolimufedik.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084063d10378---xupijasarivejuzujuwu.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/a21441fc4459db4d144ff9068db613c8/8532072312.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/916b036ec565a5cfa12f88ae01ccf0dc/zoturopavitisapifu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606c758d06e54---13671096855.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/33631983052.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860013d6202---94312707462.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/ff843a682a9139222b82d7db1856f597/85350148700.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/43576583427.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/6427648846.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/fejinazub.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/tazagidufefefabeg.pdfIn PDF document text
    • https://anfauglir.com/images/file/fuzavuvudigibuf.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/37a4d21c30f62e7b63107b87e2f2c7da/96164341795.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd39a3d563---92464116440.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2684a9b481---xatawululinivukexikomi.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/kunefusoguzunotid.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/11803875881.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/3vlfh3pi85oabht01rdkqm5fng/21291390574.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/1413604369.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082997547a11---malomabopejizamakukexajog.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/7425383471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cs+lewis+the+allegory+of+love+pdfPDF link annotation
    • 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_off000123c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C2 18684 bytes
SHA-256: 24679a1af9f1c184731e5ef38e6e9ad9c6e4b7d6c209ad73952fda05b4bfb0d1
font_01_sfnt_off000153e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BFD 10968 bytes
SHA-256: b1baa6145d8c00ec01919b2c39bd06a44fbe948b6dd464c0705ea8af86e5e957