Malicious PDF — malware analysis report

Static analysis result for SHA-256 590ebcedbb887be9…

MALICIOUS

PDF

69.5 KB Created: 2021-09-13 23:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c23345a254b8a1cf9bdb0068bba744f SHA-1: 505dfb3d44920e919419e8bca4c809bbfd62cc65 SHA-256: 590ebcedbb887be94720be167e352a693581c078c331018451508e276f4c9162
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://mylivediamondinventory.com/uploads/files/52963131965.pdf In PDF document text
    • http://timnhanhonline.com/upload/files/50757075619.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/98745731937.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d60120f1ab---87377142062.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132905cd32f0---65535518526.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/87912402290.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/nufigasirapusumorale.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/kojilimifegato.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/dusopodesit.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/fojik.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/49372502550.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/79653655150.pdfIn PDF document text
    • http://zgic.ru/!upload/files/29234610199.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/bodiripewaz.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/69749728968.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/wufis.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210909184217.pdfIn PDF document text
    • http://7profi.net/userfiles/file/88510302725.pdfIn PDF document text
    • https://felicityokolo.com/file/44269511044.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9pv3a1aehfkao4f3lluios962s/vutubivunotaki.pdfIn PDF document text
    • http://agro-partner.com/Image/files/gokovidulowiga.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/xonon.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/63074404962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=izuum+private+instagram+viewerPDF 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_off0000b162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB162 10692 bytes
SHA-256: 8bb811e88b5416d1283979a75779503a27bf89e1e6847b18fa142f6ff4bdbe23
font_01_sfnt_off0000c9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F4 15436 bytes
SHA-256: baedf728747563aaf17cb6c7a574f8fba9e2dd56141a500fed1257a4e46bc7d8
font_02_sfnt_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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