Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2f7bc30016738a…

MALICIOUS

PDF

84.4 KB Created: 2021-09-04 20:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 241dc3b7a2e0e728e7077c15c08064ad SHA-1: 3549f975936cf941af6def275c86a4a2d6d21182 SHA-256: ac2f7bc30016738a0f4ef6b55fdbd59852aacd88b948fe087e9a8ea0864f99b3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the structure and URL distribution are consistent with a malicious PDF designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://jatyn.cn/upfiles/202108/file/1627993260.pdf In PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c1d4e0ff7---37237014851.pdfIn PDF document text
    • http://bjjiffy.com/upload/madaganegixosegomepaxus.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/muvifativefimofobogid.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160739b5dbc1ca---3447731365.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/13508965575.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106192231375868.pdfIn PDF document text
    • http://sakem.org/userfiles/files/kodefakudozoj.pdfIn PDF document text
    • http://mesterek.net/tmp/39208229895.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/tekapagovebigodogelekaro.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/18056842157.pdfIn PDF document text
    • https://kede.org/userfiles/file/muzilaxelixaker.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/c518be24c9b62574b216fa9de710169f/sixarufupoxozopam.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079beba99dfb---soranu.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/20891317853.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/98259655224.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/00a246f42e78f693c23ec01b13d99c3e/panadapev.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/vitoxok.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/zerori.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe6a7dd7a3---79687396006.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/71750986776.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/60980067504.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160928cfcea4ac---66761681124.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff49a3f486---19643973706.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/84b7d14e859108af31c4b28eb75a523f/45721316742.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/8d61fd082400362f4f255735923dae47/gadujepufef.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16083005db0c66---sebozobitarozeramejizoder.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=css+tutorial+for+beginners+pdf+downloadPDF 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_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE65 16772 bytes
SHA-256: 57e38493268d1ee796aee9a8147ca8032ca61cfaf3a138ae4407d9b4ed0e5083
font_02_sfnt_off000129e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E6 11028 bytes
SHA-256: f72035816102cb4260c4101ffa2f9b4db2aa05125a963dc5d92004ad285f8c58

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