Malicious PDF — malware analysis report

Static analysis result for SHA-256 375050c85550fa9c…

MALICIOUS

PDF

93.8 KB Created: 2021-09-01 18:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4d15314a42c44f52d654ba69c74b60fb SHA-1: 5009ff1b3b1a764d7554d4acf73cd96eb3f82348 SHA-256: 375050c85550fa9c1275562bc29ef8df579b4b8d0b463080958d99bdd2a405a1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised CMS uploads or disposable domains. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/fomusife.pdf In PDF document text
    • http://giovanniseneca.eu/userfiles/files/nobila.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/3345816043.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/mutubozonozonalosufigit.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/kevitopizusababatuvow.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/kimalinemalojeturixoneze.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943c1be3a04---5741565668.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/79662e7680159bf8f10c1ea2348c8a11/74654872922.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/44527996238.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab80610691---xosimiloxaw.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/34733663779.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/73278899234.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/0021e9b54652856506c0ec84eee2f356/bokebekipesajutexuraxabo.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa42484e87e---60284999342.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/rigazobubob.pdfIn PDF document text
    • http://18554080.com/userfiles/file/lajanabopatarejataweb.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/nawof.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f055109dc19---15023907521.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210609_7CBFFAB57434E2B7.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/rizamujobebubomoget.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/rudefol.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/tukufo.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160731f1c47d1c---jonatilobadumazaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=watch+desperate+housewives+season+2+episode+18PDF 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_off000109a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A5 17388 bytes
SHA-256: fba739e7342a74d5d435684267a22c613699abea51c47c26aed86d90f273a109
font_01_sfnt_off000136a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A7 11188 bytes
SHA-256: 6354223bdc640bfe38021e8af5e23ba38fd242b1a0e381052ccd4548a513df4b
font_02_sfnt_off000150f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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