Malicious PDF — malware analysis report

Static analysis result for SHA-256 cebaa85a777cc600…

MALICIOUS

PDF

86.6 KB Created: 2021-09-13 21:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bf11e8a0a3996822e9796a440d554a9b SHA-1: 402abcd141b82c4db314e428e900caf79410f74d SHA-256: cebaa85a777cc6005f9c6894b30e0468b630645ae5c99b7331a2b1321b2e4daa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised websites, designed to trick users into downloading files. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcb093f334---ribugasiji.pdf In PDF document text
    • http://planao.com/ckfinder/userfiles/files/vapeziwimiwogavasap.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/nisexivumuvikojirik.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/bupikijefovazojawijexob.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/rikuroxefutasomege.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/garudexuzad.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/99631491991.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/fevanotozexalopamevememum.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2e46b3c0b---64952143226.pdfIn PDF document text
    • https://onlinendttraining.net/files/kubamivejofi.pdfIn PDF document text
    • https://rm-parketi.si/uploads/92544822014.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/21538445426.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133d5ca06c81---65393702619.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/70313305406.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/lekasipiviwupen.pdfIn PDF document text
    • http://vtaky.sk/media/file/22052471961.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/kevoduv.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/nopakibofogagalasasus.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368700414b1---wezavudasa.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/31298947313.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/ratowadolebog.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/sejuxawesulusewetanig.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/53640271137.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/bozumatebakoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=r+rajkumar+movie+download+720pPDF 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_off0000eda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 11096 bytes
SHA-256: 7c939ba3785cfc533b0acf478a491abb7624c97e86ecbe1a0e58d7f34afee2a2
font_01_sfnt_off00010788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10788 17256 bytes
SHA-256: 6bcc1c50ec592bb21f1fa26c2ef15bf969254e2de71f35c63a61fcda133f3c83
font_02_sfnt_off00013451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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