Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7cfbd87a06a7d2…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 09:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a00aa78f1cc9c97994446315822ab57 SHA-1: c92272320dad48e390f140f05bcf8ced921e4733 SHA-256: 2a7cfbd87a06a7d2b6a232c9368a509ab8b5cc3d9f687fbb5061a2a7460c6f41
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to lure users to malicious content. The presence of a 'pubg new version' term in one URL indicates a potential lure for popular applications. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://archism.ru/uplcv?utm_term=apk+pubg+new+version PDF link annotation
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161339a1ae93cc---7456960830.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/80638850470.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/30737542903.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/todozutevadidijudo.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/b7751531026f79c624ff28d89f77e163/mubebofepagomed.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/79108361315.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/97868313330.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/romafilolomonuko.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/93ab5f8e5331e677c1c37ce03ec0aef0/vebalebenazamumirenibuk.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161324b009e8dc---36512238135.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109020707551985.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/devufimukubupovurebuzip.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/5775645756.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/34284700299.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/0nhr4nvma57192to978b9707vs/vopav.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/folodibuvokudetamorej.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/gemunulodalumas.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/pupuk.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/34606389244.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b929425ed2---26651212326.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/wevawigonagilov.pdfIn PDF document text
    • http://ausafe.net/images/art/files/11751283106.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/88053014764.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16136c9514cb59---puzuvawodidurimumaripat.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/48231988746.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_off0000d265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 10588 bytes
SHA-256: 7ce7e47c8558e58dd2fd29e936230add80ae03a7456c2f52c3d834a12dfc9cc9
font_02_sfnt_off0001029d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 17432 bytes
SHA-256: 9df27173e8f3648bfa3f859ea68a3bd5b9cedfd2605fc2bbcdf1afb2ed9f823f

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