Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec91014d8c2269f5…

MALICIOUS

PDF

71.9 KB Created: 2021-09-17 01:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5ce1f07c26aa9c331cbb0b4cce8bb349 SHA-1: c0edfa54e362181cacb1dbc22c4912e86974cd78 SHA-256: ec91014d8c2269f574adebea3d1c7021b3ec562aeb1321bc2c1e1a8ccff1c4a1
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the non-clustered nature of the links on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://almudenafernandez.co/ckfinder/userfiles/Files/rakijonebobivuraso.pdf In PDF document text
    • https://jnnjhansi.com/userfiles/file/64846476936.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/wozowixeginorajuxojutasid.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/jotadivukinavixopufaxono.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/texuzise.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/lixixotowudutivam.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e01bd8948---biwarepotejizumaw.pdfIn PDF document text
    • http://tfforming.ru/d/files/golevekimipubag.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/9688757680.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/nabosimaderemonovov.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/pilin.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/xedusufitutakiraxazoreb.pdfIn PDF document text
    • https://hssanesteban.cl/files/datinakutagozuxotonefed.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/5792544134.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613332af4e927---21809661250.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/maseretozewelinotapideji.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/50624356288.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210901_125132.pdfIn PDF document text
    • http://flirdining.com/uploads/files/58427321721.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021921398565.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2b0e78b89---sajevamumemalekavofob.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/vedisotosate.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/49805920205.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/53496857817.pdfIn PDF document text
    • https://desco.scp.hr/files/gajuzinoludiwugokananepa.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/93992338792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=s5+vs+5sPDF 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_off0000b78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA0 18248 bytes
SHA-256: 48898924702cbadad4a871faa823c2f9a8f53b6c4e0e7e7706f2e4f24e6428e2
font_02_sfnt_off0000fd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4D 9524 bytes
SHA-256: b9efccc361b2af1029609d5e5655bb8de7313c67fdb0eaf0c9a42301c8b38474

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