Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bb50d859815a97…

MALICIOUS

PDF

90.8 KB Created: 2021-09-10 11:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af1ce4746fadb7d82543f42d642ed0b6 SHA-1: a0f2c83504ee01e324b3213c3eae78d3e1ab3b5a SHA-256: b8bb50d859815a978d00bfc961bf8eab38cf9488ee88531c79fc6dca5b5cdacd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to phishing sites or download further malware. The presence of these links and the overall detection indicate a malicious intent to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=ring+of+wizardry PDF link annotation
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee8abb762f---13507751223.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210906061452.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/72550320041.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/18371996595.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/xabilepebisun.pdfIn PDF document text
    • http://acelybio.com/upload/files/rejademelinovezote.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210905_012517.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/wajanakifipulo.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/lizukazal.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/c64ijkd32o0bms7co8q9aionq1/67698825242.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109022034348271.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/55575716428.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/91473356057.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/63162762316.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16131310dc8c1d---ripufuno.pdfIn PDF document text
    • http://aquatherm-graz.at/files/54419221775.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/49846e57edd7591156d1f0385bec819a/94469285455.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/61551175943.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/wizavi.pdfIn PDF document text
    • https://777mto.info/contents/files/97867015902.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161302555b0b05---webose.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/778e9eedadcfb635236fefeddf62da5e/60514967512.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_off0000fe91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A8 10392 bytes
SHA-256: b50063631f78b387f5d44905863314cb138ef71bc90fa8ecbc302bbf7dd1682e
font_02_sfnt_off00012e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1A 18384 bytes
SHA-256: 264e35d91e3ad0755ddc332a790554def8d1890744630bb4dd31a1c14b89367b