Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71d75845f4f956b…

MALICIOUS

PDF

94.9 KB Created: 2021-09-24 01:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ff6f5e9bd7de30ac02b1d0423bfadaad SHA-1: 8bb161c629f6df6f76863ccbdef2e377b4ed2c74 SHA-256: e71d75845f4f956b24780c9cab9322f1531858996ed819dc6726f81cbedc7e26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=glee+season+1+finale+songs PDF link annotation
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/mademenagaxo.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/bodowemopipago.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/28229174182.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/buwowosulopemimuze.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/lakipovusujipefi.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/zugeretijaju.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/offj3dupluus1acv1hn9r34gu3/nitumalubalabive.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161387364d51e4---zabujopafuvipaxujumo.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf95c2bd39---98122454059.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/fffe4cfb4a79455c3944b9a76a457574/sedetodenozasajipozidital.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/guzukagap.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/32180944227.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/nolut.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/93031632960.pdfIn PDF document text
    • http://showdoimovel.com/files/files/50448639388.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/pexewiz.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/xewibaneloxejisumuv.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/vagekovoraxifawogi.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/39924497637.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/50736431914.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/10884584699.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e614f4d6a2---53789931797.pdfIn PDF document text
    • https://karthikaspices.com/uploads/file/rozukapom.pdfIn PDF document text
    • http://agavietnam.com/img/files/92895849941.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mjft1ajc6acvvsfamhh5k4fpqf/90672789324.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/nenibomaduwetobames.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_off00010cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFF 10280 bytes
SHA-256: 679a947c34acc5c6a77595fc02837c818fa83fa703444eab326211654bbb3fac
font_01_sfnt_off0001244c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244C 18976 bytes
SHA-256: 8c47523fe91f6e9ebf55a483938ccc5dfdd69d4038f74737c8c58af2b7fc3670
font_02_sfnt_off00015600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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