Malicious PDF — malware analysis report

Static analysis result for SHA-256 d642108b458ff871…

MALICIOUS

PDF

92.1 KB Created: 2021-08-11 20:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 91a8782e4a88f831632640e708990cec SHA-1: b02e25aa75a5d939369eac81690cad654969f5b0 SHA-256: d642108b458ff871f3ec9a129c82b6864065c312d75af97341f94a9fabf398f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript and link farm suggest the PDF is designed to redirect users to malicious or phishing content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aravlicraft.com/cmsCart//upload/file/5942149751.pdf In PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c171244f28---tabaru.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1395e3fe2---tinumaravemeguz.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/wibujulegi.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/tajolewavaloduzukap.pdfIn PDF document text
    • http://andrewclaymonfishing.com/clients/a/a7/a7b0d980ee28df7184f998a87a00dbd5/File/ritusogowibomuwudur.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606eec5de3641---tefate.pdfIn PDF document text
    • https://ewt.cz/res/file/vebirojerawopirufiriraga.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/samotikixubob.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/luleta.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/taxurekov.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/zexopetad.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/7fee3b66c5a79c1ed06fefc56979e397/36888871110.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a517de14c---tigerojonanopixumaki.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/7pf9u7p5vmjbu06nnmd3oe7ip4/90555535657.pdfIn PDF document text
    • https://cowik.pl/upload/42182376816.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/6529786393.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/kugironetegebatepuvubojos.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/b34e5d11d4280c31b3476f172ef43a9b/62557716217.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/27079211561.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/53406232569.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5g222b4e4denblmlhke90hfn1s/kojidijixulusigazoxukun.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/denedasewirukebezutiwupif.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/33246302237.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/86899422614.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/mm0kuctm7b0v551k1jb9dg8sp3/68718917505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=after+4+anna+todd+summaryPDF 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_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 18048 bytes
SHA-256: d7c5da3d1d0b7db814c682bec0a902bcac072827d78e3460c61bfc6a74e33086
font_01_sfnt_off00013196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13196 10652 bytes
SHA-256: 1a4c0c7a2f82c89154b710af218d556f87bef90b392ac3a3f3e6af94e5270362
font_02_sfnt_off00014a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1