Malicious PDF — malware analysis report

Static analysis result for SHA-256 96db44b3b01f9c56…

MALICIOUS

PDF

75.4 KB Created: 2021-09-07 07:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e7d0e1ed9cd44339ae44e2fa073184a3 SHA-1: 0e3a6de47bcc308c3f2a384065adc6c3968ce80c SHA-256: 96db44b3b01f9c56567d02a7f8162b8943aea1fa887ac78e9321e0f867865228
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage, suggesting it's used to redirect users to malicious sites. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a37918bee---xaropagoder.pdf In PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/logom.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/zatedivodipawula.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/48773998825.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210830_003535.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/b7afbbacc5e1c6b6ef708892d848796b/subitezuxifitotadulonu.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7553c2879f---9086994358.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b65d30ae85971e2ffd0994dcc3113253/mogidagogisuri.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/43359131774.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/7b1f9bd87a87b39d2e0fb81889475c43/tolariliki.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/mugafufozazelajawepetepaf.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/37632343295.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/79s96m7akp1229iunkmd6d18hp/polalarokagomataxus.pdfIn PDF document text
    • http://pasted-radio.de/web/files/dijisebezosajozunud.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737720078ae---98541915424.pdfIn PDF document text
    • https://aedwea.com/upload/foto/vanagopajafijopewasox.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/fixivuget.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/6fac780e680a06be31e574e39cad1d7b/luwugilivosotemobiribose.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611b800e7efab---25016263359.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/gisewagovopelikemisozodi.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5c15b5249---58002611929.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856c1e9f3b8---92914779484.pdfIn PDF document text
    • http://royalgroup.at/tmp/11242488537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=halloween+vocabulary+worksheets+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_off0000c383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 11216 bytes
SHA-256: 02500af9bb4c5504d0b756124d22aa4f6c64c69d588a3c4ee6a53eddd7447fdb
font_02_sfnt_off0000f5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 16524 bytes
SHA-256: c94e2dc0c013051129bc7646f6fb8f4d9654be9a2f9cd2e57d6ae4ed52ae4e1d