Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a60062ce54451d…

MALICIOUS

PDF

72.9 KB Created: 2021-10-09 11:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5e0c0794e972ad6746fc067500382325 SHA-1: a43df1fb952a052adf00b30a5b9e7fe8ee65f440 SHA-256: c7a60062ce54451dd3afb5dcc0f577a7fa5c7386a9ba68bf988f67ae9811b65c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. These URLs likely serve as lures for phishing attacks or to distribute further malware. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=lord+mobile+free+gift+code PDF link annotation
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7c3a641fd51f4879db355040da9599ce/72849083427.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/32354846305.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/8794988287.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/37912149902.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/kisezexeberowisukew.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bke6a2qpc78nis57nr7pfkfil1/tavefukuzipojibolagute.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce771c1fc3---sezinu.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/97477706376.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/wifimexofuxiroj.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/88734580041.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/nagoj.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/67902739400.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/92400488856.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615df56944aeb---19732976629.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/lebutijafubonoluseruj.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/vukakadajegupivasele.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/36632862061.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/zagutugeruwebafut.pdfIn PDF document text
    • http://adice-area.com/pictures/files/78994085485.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210904_100306.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/146ce1af081ee639ac29c04125a4f7e0/kajamesagesuwitedopita.pdfIn PDF document text
    • http://tongweivietnam.com/ckfinder/core/connector/php/connector.php?command=QuickUpload&type=Filesupload/files/kozujineka.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/xogadutegamovalolewudaf.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/26566288307.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_off0000b9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B8 10480 bytes
SHA-256: aa7f3291a2126eade97491b70a094018097d8c584d5e709d5d85cba818d76c8e
font_01_sfnt_off0000d149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 17420 bytes
SHA-256: 1722d8e25abc3847ec727ce0b8fbaba82b1e5ffbb92906adac53b6d03005c039

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