Malicious PDF — malware analysis report

Static analysis result for SHA-256 67cec42809d3c883…

MALICIOUS

PDF

89.5 KB Created: 2021-09-19 11:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c9d62ed8a384cb5650ef13f9449c03e SHA-1: ea7ad71bef074bc10caf21092700483696e7b8d2 SHA-256: 67cec42809d3c883e0c8aa809b53c21592cc26f25f528d74c84f578fab308cb0
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 compromised CMS upload directories or are hosted on disposable domains, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://electrodomesticaruano.com/images/ckfinder/files/wefok.pdf In PDF document text
    • http://dga.gr/ILC/img/file/wevaziz.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/16723144083.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/54727230253.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/salaritagamivoz.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/35348076055.pdfIn PDF document text
    • http://aurora-c.jp/files/files/gedisas.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/migazimuxajuwe.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/vixutezexanipes.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/140d2b6e8cd6aef1f819b0174a9a0cae/97044419646.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/wuzudulanivirofafavanix.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/jm0f0strl98g22idq2n19s5ss3/pobidewemegi.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/sivedewikemotobumorakonaw.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/bekotijuvizawigezogik.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161308eb80f2de---wenunorosazarumesoja.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/lirurujetalemedabi.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/47455086717.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/77449449008.pdfIn PDF document text
    • http://voijin.com/userfiles/files/90263065540.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/13080564108.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/4520930461.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/wonedujagupupikukarug.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/tediwilivilesabekibeb.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/76052108036.pdfIn PDF document text
    • http://cabini.it/userfiles/files/sexolutize.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/605231405.pdfIn PDF document text
    • http://vecsecity.info/editor_up/96698892048.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/peligemijesepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+set+automatic+call+recording+in+redmi+note+6+proPDF 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_off0000f1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E7 19516 bytes
SHA-256: 3ea4bce0d2a904f9cc50304bd227beaea7093c44d15e96036a1773e7139d11ca
font_01_sfnt_off0001255a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255A 11204 bytes
SHA-256: 4ac7f548681451095d83fcf090d1d89dec686fcc06743b199e3d65bcd9c6a0f8
font_02_sfnt_off00013f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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