Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6516a3a0e8c76f9…

MALICIOUS

PDF

84.3 KB Created: 2021-09-09 17:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4a82b6a8bb59311f1c38fd0fd5b6ef9b SHA-1: 4ce9a8b1eb07b5d2fbd64fcd39b4482d11e76a2e SHA-256: a6516a3a0e8c76f9b0e0ed410808d8502814cf17d8c533326dfe4bf3d3e1ef85
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cedule-plachty.cz/files/file/85601899583.pdf In PDF document text
    • http://splogservice.ru/content/file/kesol.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/30448758547.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/zipukufopagalagov.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/fabefodapapo.pdfIn PDF document text
    • https://krajkarka.cz/userfiles/file/bepojumorirol.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/gaxukexedonudoronolurabur.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/xijuvojoponelus.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/89943407162.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/bosajifixuzikonetiwozu.pdfIn PDF document text
    • http://keacg.com/upload/files/kurunoruk.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebb1dc2ee3---zisadufemoraxanudexubus.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/30551025689.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/nufaredi.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/7510674707.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/xazilapezafoziwaxekike.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4d9a93e24ab541402f700e7bd639498f/41973973073.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210904171426.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613577c9d8c06---48245051505.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/vololejerejetesenufi.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/7065472179.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/7761662387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=download+imei+trackerPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 17716 bytes
SHA-256: 5b6ac14677de60ffb29bc3959674a413da42c59a9d940a6e474e6770dd5c1ef5
font_02_sfnt_off00012ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA7 10544 bytes
SHA-256: e17691307002afdce701aecab686aecde04c6f622118fc580df4d11b0d29c6cb

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