Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab545aa68962ae4…

MALICIOUS

PDF

87.7 KB Created: 2021-09-10 19:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 83c1deb726edf2fe42590cd530c5a157 SHA-1: d17c429d0c47856a36e26ca9e7f1fd78f7451337 SHA-256: fab545aa68962ae425d1840cf3f843b6676bfb7f6326f4336d1accab78b5b094
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document employs a social engineering lure, instructing the user to install a browser extension or update to view content, which is a common method for distributing malware or stealing credentials. The presence of numerous external URLs, many hosted on compromised WordPress sites, suggests a link farm designed to redirect users to malicious payloads or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ketchas.ru/uplcv?utm_term=best+app+transfer+iphone+to+android PDF link annotation
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161372abc86117---vorisejoxire.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/xogexozonanu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/81da7351ca31ed3ccaee4bdc604678b9/lexefatekukosepolu.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b292d8a2ce---86302649424.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/a75fb6e5047eec8de6140cefc0ef86fb/43158659578.pdfIn PDF document text
    • http://duef.ru/public/file/kosiwevad.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/sokoki.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/68872890969.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/96944821194.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/ganov.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/ziduromipanivefeduzufuwev.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312c45d7cc9---mudidukovitibip.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/mebaroku.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/43135210202.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161369092e2d5b---xazixuzimudezupama.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/jepajowunu.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/raruraxemogetulomedufig.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/687282033.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/durenu.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109010855265611.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/39189200986.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/duxedijobenufuvumog.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161319b14d421d---fomurojivisubugofibedeb.pdfIn PDF document text
    • http://client.diffuse.info/files/68266918339.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109100038387691.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82C 17576 bytes
SHA-256: e6a54dd7cece1071542533ea550463c4d6e48f5f9f129590ed1937e14068f9bc
font_01_sfnt_off000105b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B8 17704 bytes
SHA-256: cc7e9369bb8ec0a7375f8766fdaf20d241c286aa54bf684c8ac71874d1f1bc10
font_02_sfnt_off0001206a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13881 10600 bytes
SHA-256: 51c6fe985abb6abc8de64d24a385ac042a390f2ead73d3b152a167ecc5f82c71

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