Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf80cf0ed5ae542…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 15:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 84d73442927eedf9f44591b6ae0f7df6 SHA-1: bfe8e57f68546ab7cd4d37eff82662d4b9102349 SHA-256: 1cf80cf0ed5ae542ce03a1684edf8b559bd5ca15b93ef1f393a801cf73c90cdd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites and disposable hosting domains. The embedded URLs, despite some being marked benign, are part of a larger pattern of directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://lrpharmaceutical.com/upload/files/ronezeviranokibesi.pdf In PDF document text
    • https://all-stage-meditation.tw/uploads/files/61386c4fc78d8.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/34684174253.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/julinep.pdfIn PDF document text
    • http://a899.net/userfiles/file/72410223543.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/67766254498.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/93047953701.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae9bb4d28---xetegejonabogironuxok.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/regenaxomeluveko.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614364c381803---wulerebimaferolilokilow.pdfIn PDF document text
    • https://invision.buzyhub.com/files/zidiwoxukigomuvuxokoma.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16141e273e4039---50026330167.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/ponavobavunixogazepa.pdfIn PDF document text
    • https://ms1oke.com/contents/files/figilewatulasisezibuwarop.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/gotidobozotizawoditole.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/23507888515.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/71965709496.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/zebiwubuwirapebotuzuz.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/28038250858.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/73230381334.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/9856986794.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/kirasufumatinafidupo.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/75505792104.pdfIn PDF document text
    • http://deforma.it/userfiles/files/79775384540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+do+i+erase+history+on+android+phonePDF 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_off0000e7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E7 17656 bytes
SHA-256: 39d101ae70a814ab37e047606b9dc25afd9beac65e2d93e3ab45de5614077120
font_01_sfnt_off00011627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3E 10636 bytes
SHA-256: 696daaf9648c586c77ac85b911b3bb2fffda6bfad966d18d938d760bc5fad650

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