Malicious PDF — malware analysis report

Static analysis result for SHA-256 7638022ec923597f…

MALICIOUS

PDF

89.5 KB Created: 2021-07-01 10:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0b700282a2d89ed1c3a05e5af7a9696c SHA-1: 9ed4719b453717f89e68699ae675a92a2be69313 SHA-256: 7638022ec923597f9b324441d64675342293b582fbfe5d205c2d0332e83a7583
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, a common technique for distributing phishing lures or directing users to exploit kits. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/mtimkd4a4i50edou968o5t7hal/zedozawujoxebinu.pdf In PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876e5bad804---nusekinujewikiku.pdfIn PDF document text
    • http://allasclub.com/campannas/file/tevufazemilurudiguxul.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/hgkc891geoisjpmcr65l8g8f27/bavonaz.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce12868a7f---notaradaruvagesuz.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/kigav.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k909d6i7fvfobpqlt4q6jptd07/nawagikezesusa.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607700840ea34---xedivoguponun.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/kfjbiekikei93244cssuqlpkun/jobibanixiga.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e81eef1e---sidenesudofuvurugu.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/sozimofol.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becbb2be759---37523623082.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/muligukrek3n0r2qbnaiiesb4p/72803063869.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/vazetivawitu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5964523e7dce77e46513c50af61eede1/7417194855.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/18083978461.pdfIn PDF document text
    • http://jpmoto.biz/upload_picture/33254108421.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/95790991203.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/nevhh2oio0j7c31hkla5be4ap8/xabudafulitofixogowel.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/44371315413.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/50062863241.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/29d08485a257eca08d46ac06d4c1225b/mibasemotabolenozumalus.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cecf6b859---juvazinewuzaje.pdfIn PDF document text
    • http://billsky.ee/files/file/70835766644.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/be88fe07387e9abc47165d8044fb44e4/tokevetanutananako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=net+national+product+and+gross+national+productPDF 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_off0000f9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E7 16856 bytes
SHA-256: 11f8ff46df6610652e9732b56823178b3476e7f93cabb0b5c60dcd30de8096c1
font_01_sfnt_off000125d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D8 10764 bytes
SHA-256: bceff56a0e95660e7388b6225dd381fee6cc6d75225e88e57c1ece403995587e
font_02_sfnt_off00013e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1