Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e216e76fd55736…

MALICIOUS

PDF

72.5 KB Created: 2021-09-17 06:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b8aa682ca6fc4fb756345f02b62386d7 SHA-1: 956cda7d9f413408a210c94a790c0f72ecbed85e SHA-256: 44e216e76fd557363f3bdd568dd7d35cbef86c0c571fc3557445a5bf54889dd6
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to other PDF files hosted on various websites, some of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this conclusion.

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://dtyxbpzx.com/filespath/files/20210913204450.pdf In PDF document text
    • http://wang023spa.com/userfiles/202109file/2021090904054770554.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/97540669115.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7e1fb216916354e4997b0e538b344aa0/34789815700.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/kuzajulasagovoxe.pdfIn PDF document text
    • https://membermimpi.com/contents/files/53561745526.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/51324567553.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/godazanodenuzedesikid.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/zojifevono.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/12874936571.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614229651d2f9---soxeguruvab.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/90471278096.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/bobasaxo.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/96363551146.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/femogaxifexajagifamilaf.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/fokubikinegapipadidol.pdfIn PDF document text
    • https://ikima.fr/uploads/file/92041401622.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/sejizoxanikimowito.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/8475d6657c7227b2b0495030582d9869/kumutetezubalewiz.pdfIn PDF document text
    • https://rintrans.com/files/97354143659.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/9a5bd900751e25d1d2d994694656ff33/litumuvelaguziligoxirul.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/wusujabosewaji.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/90653247226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=malayalam+keyboard+androidPDF 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_off0000b9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FE 16628 bytes
SHA-256: 096bc8ad490c211e1d6126a3d02c206a16c565c6965856ac06cb8ffcf1993ffc
font_01_sfnt_off0000e479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC90 10480 bytes
SHA-256: b89e31e797dedb59cdb907a518a5c300eaf0b0c360889449d2930347067bf5ad