Malicious PDF — malware analysis report

Static analysis result for SHA-256 05dc356f654a5204…

MALICIOUS

PDF

79.4 KB Created: 2021-09-14 12:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4472d06a833fa440f908f21217f20f57 SHA-1: 02ca0ed4f040a7e9d9701f094afe0a5e2e34c417 SHA-256: 05dc356f654a52040866cd0875d6c55776c6884abd1e159708664cc3246ce6a0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous embedded URLs, many pointing to PDF files, suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://qiuyutv.com/userfiles/files/20210901122518.pdf In PDF document text
    • https://sowlindia.com/userfiles/file/zovesujokalidiled.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/zefezofatizodiwepudim.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/58667215810.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210902/0430589388.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/gobosot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613492527ba43---27429894396.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/14612103476.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/nizidupexefovaduludaxa.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/tobewekavotepup.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/tusagowevisavojefudezis.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/ziliv.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/58028238533.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/debobikoresuwidadapejixa.pdfIn PDF document text
    • https://agatanorek.com/files/file/80265488348.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/48596031107.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132581b191ec---41145884654.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/3717820644.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613261f615faa---vanixozul.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/80373597723.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/fadukukixogidifobip.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/lujovafikatigosigeti.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/70473719551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=demon+slayer+online+stream+moviePDF 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_off0000d48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48A 17188 bytes
SHA-256: 654a150c68942df2130d01cf4046e03bea2b0bb42a1e18a5f3775e439cc83a91
font_01_sfnt_off00010078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10078 10448 bytes
SHA-256: 3edef09d94d1af0e481e38efafe9e676e15122507df6a54bfe46c807478f2fd9
font_02_sfnt_off00011836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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