Malicious PDF — malware analysis report

Static analysis result for SHA-256 602645b0a809da53…

MALICIOUS

PDF

73.5 KB Created: 2021-09-18 03:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d0ed9b248ebf4a6077f51ebea8498aab SHA-1: 9d5884362e212f82ea5d955275278f2fc109be93 SHA-256: 602645b0a809da531b0f6e4de05175bce73faa687dc0b0b2812b72f535dcabb3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

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://idealist.ro/userfiles/file/gufilazumumel.pdf In PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/boteruliwufodoratix.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/83078426943.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/79768162214.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/65111142741.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/5743904785.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/xejaxudosazofamenuvefokuz.pdfIn PDF document text
    • http://stefani.cz/fck/file/9632807974.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2b2b76f55---kitokazudelotikukivevim.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/32471593184.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/18617877429.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/mitixidogadaxa.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614505a32e2b2---11102553465.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/84018859352.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/lojove.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/bamidugobotefelet.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/tixurenigizagego.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/voruvofo.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/83883120945.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da65d724cd---pixebogoxomutegivawofove.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/11074414459.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/38760852295.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/lemagonunujab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=shark+hungry+mod+apkPDF 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_off0000b3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B8 20788 bytes
SHA-256: 22a2cdd36a4953026dc41458adce17567025cd01748ed5efdfc2918dd98943e2
font_01_sfnt_off0000e87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87B 10684 bytes
SHA-256: b9a7072425018dd721bb34ed290d629a94e5967cb58f08dbc960b87eb12a2ae1
font_02_sfnt_off00010095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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