Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48b2e9de6533e34…

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 10:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 230d2e64ce3d1abf8101b6120a87e04a SHA-1: e3f094a445cc0776084414849597f6f639681f36 SHA-256: d48b2e9de6533e349ce50550e04680efec0442462ddf8ec69c8dc9423ac94882
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. Although no scripts were explicitly extracted, the presence of multiple compromised CMS upload links and the overall structure points towards a malicious document designed for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeaf04342f---91097681098.pdf In PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c010f59574556c91ca3a9a07879809bf/gatokupe.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/roreb.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/148671122160a92be478610.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/duvesuzitaremizadofolibim.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/251353017836.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160dee6bc2918a---zupavaf.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1b91c0b8a---juxokativabanukobowut.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dae41b6fb7b---43371147760.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/desekozu.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/rigepowixozafi.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/i1n74fvl0ar31lrv1935qahlv7/fojonumokebipuw.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/b3d954d48332ce0c5c3f654dc183b98a/24995891018.pdfIn PDF document text
    • http://tradotel-riviera.com/file/xisojumajidowiki.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4nbcfl5gd843ock8pjuurbu6m5/nemapedabelunupelitorufos.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/sevufalaletenoxotusomamon.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/lowekinijox.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc7ff36ce9---terekanudulurojemitupi.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/foxazumaregefurunasuzo.pdfIn PDF document text
    • http://effektfilm.de/files/file/97611176344.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a44a916709---pubiwifasibakolebog.pdfIn PDF document text
    • http://besteva.com/upload/files/15461581700.pdfIn PDF document text
    • https://ever-progress.com/upload/files/kaxisudaloz.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/makemiwimowofavatomikap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=macroeconomics+16th+canadian+edition+pdf+downloadPDF 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_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 11184 bytes
SHA-256: 74f6d5bfbc420325c2e6168ca42cb59d0310dc9cd56ce916ba6b832cc0365052
font_01_sfnt_off000102ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EE 18960 bytes
SHA-256: a47a5b9d78002ca53e15f825d97858c104b16b4b6e18eff9d3750dcc23696ddf
font_02_sfnt_off0001348c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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