Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0e4843fabcb577…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 10:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7957f7752105e8569d8c5522d2977b6f SHA-1: 6fe9be3fb4b6be3d4caccf3b1f10f553234d815b SHA-256: eb0e4843fabcb57796df5c527fe31e0721133ec4d006b91e8ec1e956847b5ad1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=best+chinese+games+android PDF link annotation
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/dusabunesupafelisam.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/zewaxitavusixizamer.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/tipol.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/xakijirumo.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210916010921.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/88751003889.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/u84ehb6736kv2pftmdg1389jj2/39519214322.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/41784927823.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/76195184899.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/73683092868.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/16161426176.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/nelilug.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/65782262993.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/77604238883.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16130c0b95f471---8407340525.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/090628462417.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/37164463640.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/gulibamirubev.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/fcg4591nh4ujrkbar92es17p90/21321064839.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/kusoxabid.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/90206527262.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210911181229019551nk77ps7pzfg7.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/589009549.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_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 17676 bytes
SHA-256: 062868c8acfde12e21dad4eba4eed9cc23a6e251b29fd50caef0317f33085c30
font_02_sfnt_off0001279a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279A 10824 bytes
SHA-256: ada96a331d857d47bfa1f11163c64d91bd553bbfcf236bdde3227ec19d5e4170