Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde859d23835f9f7…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 21:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dbb0fa9b4b100b40b3ee02627661c453 SHA-1: 6ec5b271e81694e9075053bf412ff7aac098ef29 SHA-256: bde859d23835f9f77870a6b0a05ec492cb210e062355a64eb790fabc00c214ec
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://nenkin-t.com/upload_img/ck/files/zoxevumitexevozatipase.pdf In PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/44105467225.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/83264091767.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/764409b3974709c612a49c55b8a50d19/53753615849.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/ranonebigotukipimovoj.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1610cab33b90d7---77477166333.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16070feaab2619---87993932853.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/kuginukewigasotosixan.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609189424eca9---vadisizutera.pdfIn PDF document text
    • https://europartner2.pl/uploads/63738059243.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/bebulowa.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/36182391323.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/xuxorotonekotewis.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079ec012d51f---sinesozifaxosilip.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/nevalodorigon.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/015d258fbdeeff9b1603f6e1e6333ddc/11134450592.pdfIn PDF document text
    • https://afayl.com/userfiles/file/milujigi.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73928677775.pdfIn PDF document text
    • https://arerp.kr/data/file///84242953351.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/ecdbe5d535735fbea032cd89c64a8b2b/39812874720.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/vifafibuw.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/bazuxime.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/5927b4f3d1a082fdacfdc38a5926bfe5/48984449656.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/0rqh1cai8cki4sd3lvpq6its80/mowufobil.pdfIn PDF document text
    • http://partnercable.hu/files/43284683330.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/10019604448.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b011d7eced---voxugapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+great+gatsby+wordsworth+classics+pdfPDF 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_off0000d267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD267 17460 bytes
SHA-256: 7f129eb1326d15a05219e6ed7c37ec3545e92613aff20062a02a23fc292aadbf
font_01_sfnt_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 11100 bytes
SHA-256: 64a2040cd12fab03bb061ec6dced2a9b939e305033546c6a24298fa980eed421
font_02_sfnt_off00011964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1