Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e1f3fd995a6147…

MALICIOUS

PDF

84.5 KB Created: 2021-07-31 20:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 56e94d6818567933f74fb81fa5b4bd92 SHA-1: 329365a6893089342a72cd9666307cc545dbcc16 SHA-256: c4e1f3fd995a61478b0055c1bea1f60dc2891b233225a76ddfdd3b1aa0a2cbab
156 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to numerous domains, some of which appear to be compromised CMS upload directories. The PDF structure and embedded URLs suggest an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=cuantos+metros+cuadrados+tiene+10+acres PDF link annotation
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/65669327886.pdfIn PDF document text
    • https://istanajp2.com/contents//files/sakizelok.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/polisonabejonib.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb84c3da06---42365415997.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/71315275805.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/23162689027.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/87260790506.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/punibuvulofineginu.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb7a8e485d---xabopezirefomaju.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/74343861055.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083610ab0176---jewulodilarinoj.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/retubixozogejoka.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/5088b8bbc9041b9f45eb0fba0e1f53a4/suzerofuxejuwevonedese.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/72462572479.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/6v180vmu6vo0n29j1s6g2tfn2d/30445024089.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cca885d2c3---71667959406.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/38552202713.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608081d90b126---wamesedivaduderixake.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072894743537---41330968356.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/rifiwoluxinepodifivizile.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/piwavibodolog.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/94528311797.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/93145858568.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/20030704878.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_off0000e6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 10788 bytes
SHA-256: ae97cba610c8cb657e1f1df5b360aed923f76e61fe55bcab118e64a915ef91e0
font_02_sfnt_off000117c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 16940 bytes
SHA-256: 5c19cad662378704cecbbb5759d9b4bb465e17e1a5b0f2dd539ac8ab60775502

Open this report in the interactive analyzer, or submit your own file for analysis.