Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c774f124b44192…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 23:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1ec02baf7c22878985bb2cba5b54f868 SHA-1: 456fe9ccbfe67953f4ec0ad55456b5922d39ecab SHA-256: e2c774f124b44192319d4ac80a0fe5ab7781ee9d389f6a746ec7c2ccfbf069ae
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs and the nature of the heuristics strongly suggest the PDF is used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://petala.gr/userfiles/file/bopoxovijudijupewunagik.pdf In PDF document text
    • http://larben.cz/media/images/upload/file/wenaxapo.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/6276447601.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/panugupataxu.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/68736976830.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/ef565fe3a350b553eb628796a240ec8f/zevofovilepexax.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/40639945471.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387fccbc028---mofasuvad.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/foforuwukopilar.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/besulomo.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/rilezup.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/wusokigevoxev.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/womebowef.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161315bd8e1013---20205895441.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/wigutimevizizefunowuzumo.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141946648cc6---toxokagizo.pdfIn PDF document text
    • http://salt17.com/userfiles/files/20617121563.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/dejabojukokikeju.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/wanadejijitanad.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/99301081484.pdfIn PDF document text
    • http://cga82.com/admin/File/levajumejijadim.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0872edfe6---29146081246.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/94013192694.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/72014203687.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/2153129998.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/71373456786.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/felekim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=goblin+slayer+light+novel+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_off0000b9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DD 17988 bytes
SHA-256: 01469792d31baeaa0d9a5746e5ae46b696b909454de743192efa55ebf5bc4429
font_01_sfnt_off0000e886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 11136 bytes
SHA-256: 7f1d31c4b7e682c0574c825cddbef332b45f80a47e47a5a66ecdef7122e1913c
font_02_sfnt_off0001021d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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