Malicious PDF — malware analysis report

Static analysis result for SHA-256 556772f09dfc3c7a…

MALICIOUS

PDF

72.0 KB Created: 2021-09-30 16:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 892110fb8458ab9c3fc7df7b3792dd01 SHA-1: 73813c999af35fb715742a905f9663d4b085c244 SHA-256: 556772f09dfc3c7a720383bb510e42d5b39d2101ce386409dbc4ef6de3271c43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/996b49b127c7c86ac0a590bb5764f0b7/ruvasala.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16149932964690---vejogo.pdf
    • http://bukharasuwanee.com/sites/default/files/file/58522147318.pdf
    • http://budoprojekt.eu/obrazy/file/serusodumopan.pdf
    • https://jordanadams.com/ckfinder/userfiles/files/13054052673.pdf
    • http://trips-in.com/ckupload/files/fobuxejife.pdf
    • https://nasco-ye.com/uploads/file/48058976160.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9aeac5a2d---lovuluk.pdf
    • http://semanbio.com/upload/files/wapolazexerusexoputifef.pdf
    • http://cdmvt.cz/sites/default/files/39403207594.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/lamuxawowokabumezepe.pdf
    • http://exosportsante.fr/ckfinder/userfiles/files/82248966351.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161524c6e94c5d---xinujodanuniji.pdf
    • http://print-printonline.com/ckfinder/userfiles/files/sufaxuwedibolarex.pdf
    • http://marthomaiticherukole.com/userfiles/file/41118453076.pdf
    • https://wintechindia.in/ckfinder/userfiles/files/1910829962.pdf
    • http://pololanna.com/user_img/files/pujujel.pdf
    • http://boki.hu/editor_up/lofixakemigo.pdf
    • https://perfecthospitals.com/ckfinder/userfiles/files/15710806922.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438a42431c0---92035105062.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1bfca405b---nuwedidofu.pdf
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/tofemifeveromapewu.pdf
    • http://www.mab-solutions.fr/upload/file/99509190580.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=drishyam+full+movie+hd
    • 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_off0000b4d1.bin
74a4a349dacf2131a9c9f728a8634224a3550bf92ed639bb0995ade7b07294a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D1 10696 bytes
font_01_sfnt_off0000cd68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD68 16792 bytes
font_02_sfnt_off0000e57a.bin
2865f0a6ff0030033c1556766e3a329ce8cd569b25332a9100963da176f0aff7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE57A 17416 bytes