Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5afc1ca5d704aea…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 10:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 655878928bc506e11c945e80e0be9eb8 SHA-1: 29414a825bd6bc9fd45328f9a626200ecc655bb4 SHA-256: a5afc1ca5d704aeada08b3f651f5cdb7f7972f95e2ef4a273269700b7081d1a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of hosting malicious files on such sites. The presence of a 'cash app apk download' URL suggests a phishing or scam lure. Although no scripts were directly extracted, the PDF structure and link farm nature strongly suggest an attempt to redirect users to download malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://perfumes.dropship-tracking.com/userfiles/files/tiwiwijusuvijosivifu.pdf In PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/170703_24844121807.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/abeadb98fb8f8e235931293fd6195944/93162670383.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/powopake.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/fafesigib.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/wokujibejagudiwivan.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/63956762778.pdfIn PDF document text
    • http://pinxedien.net/upload/files/xamasojedif.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138bab972386---74329026598.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/lenebajubopuli.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/24341030440.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/bewaluxazinigoxipolebokuv.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///retimogewa.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137a0c4b66d5---gojeselejetu.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/felikulozupajojaje.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/92418165564.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/vozutoj.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/fetofiwogelekogebeludir.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/39867020827.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/gamagojefulave.pdfIn PDF document text
    • https://norservis.cz/files/files/81504164959.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/kokifavipanuvunanojig.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/kelukipurapofitabo.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/9567739460.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/11658979274.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/mejufiguvefekuxan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cash+app+apk+download+for+androidPDF 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_off0000d217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2E 10576 bytes
SHA-256: 5dea06be4ba270eb891d62fc9103df3fe81afa7f0c220a8acb6cc8382de6779e
font_02_sfnt_off0001023b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 18792 bytes
SHA-256: 6386fc2ca825c9e10b58dc88c46370608be69fe157f0761beaaf5a98cf128477

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