Malicious PDF — malware analysis report

Static analysis result for SHA-256 d127a80812e5e6e2…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 03:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e02de7ebfb58edd319908531a1051170 SHA-1: f35a796d14bbeeb2a7b4ce0617b96ea6499c5d83 SHA-256: d127a80812e5e6e2741b99b3d9f841a0e0fed34f51df0512a7569187b493f92e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of numerous unknown URLs suggests an attempt to host malicious content or redirect users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://crystaltrade.hu/data/file/21370630642.pdf In PDF document text
    • http://31kouqiang.com/userfiles/file/1631899511.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/jenomaluwesebogo.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/wodurujaratifutu.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/damitazatenisepo.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/31939843837.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/58263793638.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/85858627181.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/xidisivodaxozilimawogo.pdfIn PDF document text
    • https://csn-alliance.com/data/files/54781291093.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf6f4917f3---3305322647.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/49185450207.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161450fdbaf372---81987112601.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/63485899763.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141f6cda2718---32787013889.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/latudukifejimodatunawax.pdfIn PDF document text
    • http://lagrupacio.cat/file/32350502817.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/wobuwanomunanagonatimuw.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/gilozijudon.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/65595532783.pdfIn PDF document text
    • https://ka-base.no/images_students/files/zodona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+default+alarm+sound+downloadPDF link annotation
    • 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_off0000ddb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB5 10680 bytes
SHA-256: 9dfa1feb0abc0fe85fe1237868a9efc5e48bebf6e3c34a6d7955f473734401f3
font_01_sfnt_off0000f63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63B 17936 bytes
SHA-256: e25e706af8ca709dfc176ce23d78ed9fa4e3cc9380f2a71e9498fd5d65bb933a
font_02_sfnt_off00012496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1