Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6475d40551b85b7…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 22:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1849aea882f43e6ffb08530b6a7bae54 SHA-1: 216cac90913f54cae703d16025601c33a1bfa405 SHA-256: d6475d40551b85b7a7bca2aa72aefeed99cf5e99deec6ac27b1c9c0b4581a4b4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://orangcar.com/app/webroot/upload/files/nasezebomudirafuwabizigo.pdf In PDF document text
    • http://zhfangyuan.com/uploadfiles/files/sinelonela.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/63937125864.pdfIn PDF document text
    • http://stevis.cz/files/file/fopetewujeb.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///mexaman.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/3323126580.pdfIn PDF document text
    • https://matratva.in/userfiles/file/pupiredijuditazilevikid.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/79464012813.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/98444369625.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109120744597421.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/gajar.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/20703064172.pdfIn PDF document text
    • http://artospace.com/pics/file/39304207159.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/desarusixuvaxolawu.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/fetutu.pdfIn PDF document text
    • http://grimastone.ru/files/85059872143.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/dibajimadad.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/dih6rrs16um98focif6m81kne0/kujagex.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/dib9od66jjaclpm3huhd4hvptu/30732225264.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/9810518106.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/bozaguzedemisa.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0f23ebd34---wusif.pdfIn PDF document text
    • https://renault-service.com/userfiles/71921637433.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/wakifafasovime.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/34479570177.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146340069fec---77396344404.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/jisabigemivokerilotajuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=installing+windows+ce+on+android+tabletPDF 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_off0000d024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD024 17932 bytes
SHA-256: 3b36eb7db106d39092b688fc2c3b74b4b86cda1e578ab798363a7c767d6811ae
font_01_sfnt_off0000fe28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE28 10720 bytes
SHA-256: 0614eaa9a54177a7b5c36636ef25f802d710c71daa1c15df998dad5dac88f862
font_02_sfnt_off000116be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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