Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d5fe905f6501c2…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 09:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 869d9e8329cc0a143f4bb1d0b281823e SHA-1: 4d67dd14eb0b129db515dcc789dc2cded6de73b8 SHA-256: 87d5fe905f6501c2337a5dd5d6f1fbf5b8aae62d7be74a8de219cfb925d3ea13
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress sites, designed to host further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristic firings suggest an attempt to redirect users to malicious payloads hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141e1127ec30---98184697257.pdf In PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/xinedugitutewovik.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/403hgcgi8e7ubcj4hapttb84t6/dazumex.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/53610482981.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/telujukiv.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/98956278721.pdfIn PDF document text
    • http://soc-in.com/data/media/files/69101333045.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140679ecd642---debewa.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/87340369384.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/tididuluwija.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/wavawisirobozo.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/lakarobarirexo.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/suwovug.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210912155249.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/8520923264.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/lufidagoremurezosu.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/41130411658.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/delujimagetazafibivuse.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/wixawulovakinas.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/63638416914.pdfIn PDF document text
    • https://blogsma.com/files/tifinegapabopozonoxipu.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/31712397590.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/winedekivagetureniwipejew.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/21052083450.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/47672972479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+house+with+a+clock+in+its+walls+free+full+moviePDF 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_off0000d45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45D 17620 bytes
SHA-256: 56393819ee3950468980d68cdc4808f752b50a8a1e80c7a509f8cd2c7115e590
font_01_sfnt_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 10908 bytes
SHA-256: ba9dc79a4ef9b4310a642b0feb1d590fa1002d41fc9237d56e99249cd03f9b3e
font_02_sfnt_off00011adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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