Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d4ab0c780b5b40…

MALICIOUS

PDF

72.4 KB Created: 2021-09-12 01:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f6ef45e0a501ce3d1c8a798b66dfee9 SHA-1: 9d025adb8146efe3df831f4772648ccd383efe99 SHA-256: f5d4ab0c780b5b40a9a9b63a3727eedd8ce873e42127a1192ce8af5f71690518
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://inwebjor.ru/uplcv?utm_term=what+is+meaning+of+pdf+file PDF link annotation
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e49407531---bixubujolijanabam.pdfIn PDF document text
    • http://asqcert.net/files/files/7864623935.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d08dbc9c7d---katenokokonudemapazut.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ba6f015b7e2d6950d34d347d140595b0/mirowadeg.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed777deadb---30961002903.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090418080027.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/kuroka.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/6675834671.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613361e1457db---zedakesuto.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/93834274837.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/59404442080.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109031637115886.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613639361bb37---xegodotibezewaxi.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/nilijigisusirupi.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/nesug.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/xumoxuza.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/kigomejevaporatubadas.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/zidigonixiwowokuvaf.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/36634994220.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/78880380854.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/31895884134.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/39698933402.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/080509305322.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_off0000ba3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3B 16188 bytes
SHA-256: 2defc7d1901129f5e1489ecc6cde143606d7990fc2a7398bb05493c935e301f2
font_01_sfnt_off0000e377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE377 10836 bytes
SHA-256: 215eceac512fd88bc7e788ebf994eb17ca89df9bb6956cd856d263402d8e99f2
font_02_sfnt_off0000fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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