Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b32dc6acf8a8125…

MALICIOUS

PDF

87.3 KB Created: 2021-07-01 16:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86012857ecd84894e19ceb0d32ceef5f SHA-1: a75bdd80552fbf918bd0f1885b3c553303518cde SHA-256: 1b32dc6acf8a81259afa0c3ce3b6e5612e404a8b2dc37381cc1d24fa8c7f158a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Multiple heuristics identified the document as a link farm, with several pointing to compromised WordPress sites and disposable hosting. The presence of external URIs and IP address literals suggests an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://asbazainville.org/userfiles/file/kojozeruse.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/4b28a846518bb7cfb5b05bbe61d323a0/sarufuru.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/5k5lid45pggmae4ut3lo0lhfm2/mupune.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/d885d427aae36d3798b147d9bf3d3b34/48093752641.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087869206ed8---kesumovusubuk.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b76dea828a6---lafepisuvag.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608db931d647e---82275757108.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/32123314274.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd7dcbdf3---wuxila.pdf
    • http://aqbnb.com/uploadfile/file/55994906063.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/8aaa2d7831ccdc19d38f9218c6c28007/memutura.pdf
    • https://acgroupenterprise.com/userfiles/file/fuzox.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cd269d12a---28586090463.pdf
    • https://aiaciran.org/cache/fck_files/file/43607291544.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/7bd2aa92869e5c51ee431e8265b634df/6264461764.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733ba17a4b0---ritazifalabudubuduvurerop.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a3daf887a5c---zikakafikuzizit.pdf
    • https://giolog.biz/images/bulk_images/files/73237262479.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f19b26737d1d3eb09087f70ffd25cc55/devidiritom.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/2017e942c1bab44c434282222ccf9102/11038207885.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608205481cce1---sobotagob.pdf
    • http://bakoca.hu/files/file/84713684954.pdf
    • https://cremyco.com/app/webroot/docs/file/65343226023.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=nc+cdl+permit+study+guide
    • 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_off0000f204.bin
2ca3fa4b59556d3417bd71c2ebed1ded9c1b76e9628c06144337969ada0e1645
pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 17464 bytes
font_01_sfnt_off00011ff3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF3 16792 bytes
font_02_sfnt_off0001380a.bin
0e009d19a06e51dd149af51d762af5a5a868eb249cbcd7daeefcf50f95f7255b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1380A 10664 bytes