Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6d192dd5a13aee…

MALICIOUS

PDF

73.6 KB Created: 2021-09-25 07:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2545ceaf45e4243c5736d4694ed83698 SHA-1: c5da0c2decb0a1bcffa7e8a4908670a8e7c1fb5b SHA-256: fc6d192dd5a13aee0236f5368a840e4104008637e793eaced2d5994c1b38cda2
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on potentially compromised websites or disposable domains. The presence of multiple external URIs and link farm heuristics indicates a deliberate effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=android+process+acore+problem PDF link annotation
    • http://innersolutions-uk.com/file/46083893607.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/79604652334.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/60769928856.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/difejitopomemirexati.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/46367599597.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/17078458176.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210912122303.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/59395981395.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/nujegosijukuleje.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86196260067.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/xixoruxawizomaxufi.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/guguzelujagazez.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/ralonek.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/61788931561.pdfIn PDF document text
    • https://renewone.de/files/4667807460.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/6079031562.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/muful.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/a4ebc140b2ded6470f9fa0b539af3012/13997890198.pdfIn PDF document text
    • https://aashianarealty.com/file/23052554472.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3ca994f81---92196714297.pdfIn PDF document text
    • https://eurotig.ro/file/77697537128.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/e53335360be4fc7bb11cd169fb180070/xujidos.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/saregivupebizenaberapon.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/72587897003.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210924_36108F25473494EE.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_off0000b89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89F 10700 bytes
SHA-256: 191312ac9ed177504f60a1e62bfcc3d51bca7c1ce73d917c12d43b49dd90316f
font_01_sfnt_off0000d0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DC 18504 bytes
SHA-256: 839c6646e461615c4bbce1012b352b75e028d59dca4836f5aad10e3977768d81
font_02_sfnt_off000100a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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