Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4da56dbc85e8372…

MALICIOUS

PDF

82.1 KB Created: 2021-09-02 09:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7c7728c089eaa6dcc939dbe24b4f026b SHA-1: 4470d4263033fda908e1cc891bfa6503f31e8ce5 SHA-256: f4da56dbc85e83724dc9c7f90399b7c40753ddd6469c1823a4f51e7e2623bdcb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate the PDF acts as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=gown+style+for+baby+girl PDF link annotation
    • https://spiuruguay.com/ckfinder/userfiles/files/40777053821.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ffe9efe3d---vuxumozogagamanijovawaz.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/fitid.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610cb013b3bc3---takisikusajugogoxilipix.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094902cd57c6---bafisarifef.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf4d0ee770---febufali.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/wetixolizub.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/tubesuwenesorob.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5e0bca5ce---taxexutarivu.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/19007543563.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/3o2frle8gedreji8utb5ag9klc/kolixugekezusexeneruta.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/vubogero.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/93469860123.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/95205617345.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/getudabe.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/paxun.pdfIn PDF document text
    • http://charnafamily.com/clients/60216/File/gobiwiwabolijam.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/55518515689.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/24412642639.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae250903e---85389131334.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/e6bsfa08u75f98afh4tbjs0co5/44702963959.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/velaregageku.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/5c1507986eb23df04c695e7c46327740/39914286294.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/kosatepizinavazi.pdfIn PDF document text
    • 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_off0000ddea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 10768 bytes
SHA-256: 802798edc6c06ea6ad67e646ec659c04ee21bc4a086f8e5ce64e26240beac5f3
font_02_sfnt_off00010f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F17 16532 bytes
SHA-256: d5e30460f504a0c4b6bd357fc2d4b744efe6a6d34e16fbf073049a0ae7ff9ba8