Malicious PDF — malware analysis report

Static analysis result for SHA-256 a504ebe5d5919857…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 19:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86394da78a81d7c085cbabbcf55d835a SHA-1: 4bbc175efbff196bd4e6d88295541354b252952c SHA-256: a504ebe5d59198578d52ff6cc946aef970a225c85346b8ebdb2c84394abb6688
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm to lure users to malicious content. The presence of multiple external URIs and the 'link farm' heuristic strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://receptabc.hu/images_banner/files/86253933660.pdf
    • http://chronocertif.com/userfiles/file/wibesesefilaranote.pdf
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/latisebaxumaxurugi.pdf
    • http://colafranceschi.it/userfiles/files/jupinifazab.pdf
    • https://oddluzanie.net/userfiles/file/74605707451.pdf
    • http://sinostandards.net/upload/files/79348367488.pdf
    • https://maria-galland.ru/files/file/kafadixuwowameli.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e74359578b---30354070470.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130113e3d603---nelibixalewiwerax.pdf
    • https://ehbo-oostkapelle.nl/userfiles/file/17155512200.pdf
    • https://www.prshots.com/ckfinder/userfiles/files/jatax.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4accf793---77790958682.pdf
    • https://saksisan.com/upload/ckfinder/files/vafume.pdf
    • http://alhambra.kopanramen.com/uploads/files/7549324726.pdf
    • https://pmsp-me.com/userfiles/files/rixizukuduwaxazizovojodi.pdf
    • http://guowangcable.com/d/files/81608270974.pdf
    • https://dpengineerindia.com/admin/userfiles/file/76640695412.pdf
    • https://karinbentum.nl/uploads/file/73471271161.pdf
    • https://thokhoavietnam.com/upload/files/ladoturupopiseles.pdf
    • http://lagrupacio.cat/file/78691663269.pdf
    • http://futimisdev.com/userfiles/file/rejuzovapijivesatosub.pdf
    • https://aymexco.eu/ckfinder/userfiles/files/bakobarezotariru.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ref52ug3k8l05dijqtn847h7h1/vudanuwojudawologivupefit.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=bekaboo+web+series+watch+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df74.bin
6aa1a47d8d4dc5aa567b7a220aa5c66128a04dd29b16daf807907ebe04f6ec65
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 18168 bytes
font_01_sfnt_off00010ec3.bin
fdbc8688b0ece124534ef8ec4a2256979091f748e81f927fb41e2a7f44ab3b4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC3 10696 bytes
font_02_sfnt_off0001275d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1275D 16792 bytes