Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0c2fd76bfd3a2e…

MALICIOUS

PDF

86.3 KB Created: 2021-08-24 02:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 35f37e352e0fb928e5f09e22e8916435 SHA-1: 2795a1428d5e00ef0d0e489e2b7425632d02c76f SHA-256: 4e0c2fd76bfd3a2e9718c2c97a93a4a8ceaa92366cb9d3168c44f418fdd32323
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs, many of which point to other PDF files hosted on potentially compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm and external URIs suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=class+6+chapter+9+question+answer PDF link annotation
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/39360531882.pdfIn PDF document text
    • https://ibextrail.com/editor-images/93947550245.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/surarivod.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/wuzizap.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/fakekolatemakilukunakigig.pdfIn PDF document text
    • https://capecoralliving.com/media/file/24985026850.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765af9bfda4---17647550341.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16071b157c57b6---296212759.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1625788078.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99d3a964a5---xinutojowotaxuw.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/fasadibakam.pdfPDF link annotation
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f43cd6c18---vifogavivinezulofolebok.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/jalalumivipuriwugolewab.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/36096905879.pdfIn PDF document text
    • http://it-hair.com/userfiles/bitisutomerigun.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/38674763074.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcbe517172a---96247226126.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608af6a0ea308---96976306379.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/75113397515.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/gedolalasokobabebusu.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/kevubagawebir.pdfIn PDF document text
    • 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_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 11172 bytes
SHA-256: 2ea65a5d748832d4eefa7374ab18fa100f4551fad0fb4b39003b9386610ee4cb
font_02_sfnt_off00011d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D58 17348 bytes
SHA-256: 6cea615639cc7f305753f9a277f15a88a3c1a5d91c9476e9e927e5d4714faa65

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