Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ec83aab89ac212…

MALICIOUS

PDF

72.0 KB Created: 2021-08-30 20:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b59f31bbb00ea3890cea9fa0267c103 SHA-1: 70fc6e5567544cf29427f95c6ac6a7365c1170e5 SHA-256: 40ec83aab89ac2122828f2db1902948bdbe638b498e6eb4e1b43d79cab7c9eed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611df481c7306---54444856552.pdf In PDF document text
    • http://americasbestmanassas.com/uploads/files/janawezuz.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/zufumemunakig.pdfIn PDF document text
    • http://health-bridge.in/upload/file/jujumilogidubedufawax.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/38415672560.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/54705482326.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/pegatitimifebaja.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/17463423570.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210614012940_std4hr.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/79427502747.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/468925a9804bf8055e3b0db8a26be78f/81917290262.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21b54b6fce---45270709952.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/72003791789.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/96616778288.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/82241088911.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/4129992236.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/wemofezuvono.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/19677987733.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/934otpdh8ji8j4ka95jtkk17he/sivuzivodafomirimino.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-27/20210627073126906985.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/rajuwalalemejas.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/misibefufuropo.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/lexim.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/70034404753.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/15990637120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=will+ferrell+movie+quotesPDF 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_off0000ba00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD217 10412 bytes
SHA-256: edef7e1f17dfcd1e21b11eb2ad773958a83e493071d9e38d0a4a5a11c398aa8a
font_02_sfnt_off0000e9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BC 15776 bytes
SHA-256: 5587311f2de7e9ce01e9bf1e5b4d6aa20a930823b2d4d3ee0f36939ae6198d46

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