Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1aab8b4fd2704b1…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 21:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 61ddbd208e73b39110216611dbc8b730 SHA-1: d805e2bf1332c731b234a075e5588e84f20bac1a SHA-256: a1aab8b4fd2704b17fd0cfd42bb1ca3c6dd6c649e6f803b69177d9be4fa330aa
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://viettranslators.com/webroot/img/files/39765269724.pdf In PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/8652109757.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/jipudimizudijifudebe.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/24687285298.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/0391f21932db4da0565b03e44be0968a/49982664491.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/32944898664.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/gasabozukadibilud.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/76840974795.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/notidajidokubamukizekos.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9e75781ea---48712449089.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/xofujitexipema.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/20654179075.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/76662452027.pdfIn PDF document text
    • http://cabini.it/userfiles/files/57118610588.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/bobupilexogejamofu.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/logakajek.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/69306539144.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614660e0049d8---61205264888.pdfIn PDF document text
    • http://netflor.pl/upload/File/14140876514.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/71379222224.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614741fa699f3---34162196935.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/sekumuxexasegobavararap.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210906075554.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/poromakifasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=difference+between+android+version+9+and+10PDF 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_off0000b0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E7 11060 bytes
SHA-256: e752cf9ea9c834207d8d31867304aa5782cee3bf886b2c6cce084693e31a2a69
font_02_sfnt_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 15288 bytes
SHA-256: 68654da20fce02571779e56e042d6fde49d00ea69585981fb6cb38329f8f9ecf