Malicious PDF — malware analysis report

Static analysis result for SHA-256 89eba66f92aaa47a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 00:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1fb8e0405a395a77d7b41ec26c3aa214 SHA-1: 92aa3eeea68774056835a797468baaec3b22d702 SHA-256: 89eba66f92aaa47ab1bed3854ba7db794532a8855518b7e6d5a798e4891cfaec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The presence of embedded JavaScript and a high ML classifier score indicate malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or trojan distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e8714bd046---juzesa.pdf In PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b630627db---54615069073.pdfIn PDF document text
    • https://samowar.ch/upload/file/nogubosizifoxebalisedezad.pdfIn PDF document text
    • http://ore-processing.ru/d/files/vudewitewo.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/wiwov.pdfIn PDF document text
    • http://guitarenko.fr/img/files/xijonexebukagit.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/65685855960.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/39218941148.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/rerulejuvexerovew.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/70437794683.pdfIn PDF document text
    • http://belloverde.net/emailer/file/lelivigev.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/bafigoxojoxebuzelibi.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/13405723452.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/52929733323.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/94f43d7002bebad49055a820507dcdcd/53339921193.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1c2444e22---zerutug.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607465bca44f0---91523481220.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afda395d77---bulozabetitebidi.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/tavaxomabezudiruti.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98be20789---72846376998.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b167bb5f3b5---98143080357.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210828121835.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/52d5e01e56906412ccb5b98c48e90243/1590523298.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/juvexepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=doff+and+don+ppePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a058cf9e6e871d28b7b1f452736f00f3/24186562951.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_off0000e320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE320 9988 bytes
SHA-256: 3ab099c84b9a46286639163d4d7670620944e98a07eae1a1072f31a51a3737e6
font_01_sfnt_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001115f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115F 17292 bytes
SHA-256: 5ee97c89a02ebdfba88150e8e489d243ea19cdc03fbb67dfa7b36b9d42d18f3e

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