Malicious PDF — malware analysis report

Static analysis result for SHA-256 00792c1980e9b2ca…

MALICIOUS

PDF

79.9 KB Created: 2021-09-14 02:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9156ff4daae26fbf24507c1afda02dfc SHA-1: 5c017dc7581cd64ba2f0a165b55e9e450e700e1c SHA-256: 00792c1980e9b2ca2170f313691b29024635335f573a445a74c6b30bb7c5f85d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=how+to+add+more+ram+to+phone PDF link annotation
    • http://ikhmongol.mn/ckfinder/userfiles/files/vutifarutekolasadik.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/15121874824.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/97857913556.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/guzeweb.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/kigipuxobemuzurul.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/25152093106.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/sikewowati.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/didojojajovit.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///85286059727.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/fudelo.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/5f892a7e6ed711d5875ce9b73f37de6b/buwomepejaxam.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/27430778939.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/76232725035.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/bojoguxaxufu.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/mozupiladawiliwivazetava.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/0e13d28dacd85f68a46ad229d5ea085a/rofuwuvevi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa5a4ded20---najogozorimiforupeki.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/37186404123.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16132a07f102ed---lukexuzixekim.pdfIn PDF document text
    • http://alkanboya.com/files/file///39722030082.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/83910466638.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/zezopi.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/33272555635.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_off0000d59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59E 17328 bytes
SHA-256: cb65907ebcda9e547071ddbd311e8a3d1c6a6e9cc41c79db9fe8445c04eb872f
font_01_sfnt_off000102a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A6 10428 bytes
SHA-256: 3adeeeaf5f10924aea8ee948a06818d5c797e9a22b12768f44307c6a72e249ea
font_02_sfnt_off00011a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1