Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2caffa9b193ef0…

MALICIOUS

PDF

102.3 KB Created: 2021-06-19 21:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 662e9f060519d64aaa5e23cd911c52fc SHA-1: d5fd340a7fd5081cd7cd13fc4cc639521ca34fdb SHA-256: cf2caffa9b193ef01ae8e33b355bff5e786d0748fdd145758234d9b65f9e332e
196 Risk Score

Malware Insights

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

The PDF document contains numerous links to external resources, many of which are hosted on compromised WordPress sites. These links likely lead to further malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary function appearing to be directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c20897e79f---nijofopepevo.pdf In PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/8798bd53844481f5e820987af5ad38b7/jemijuju.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160984a408e174---3559645172.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/85481848297.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a21d11e2627---16890590166.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hlkoar70hl7guq51vh4s72bls3/komilawaxuwisiwinas.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794171555ee---43704659892.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f108bc3cef---69692643185.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/zowotuxoduzevixizegun.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/afd1208ec5a72d9586a1b80045c9a8d9/78067837702.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/pezitarufuzigeterogixov.pdfIn PDF document text
    • http://nature-revive.org/files/file/33388366263.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55177951a7---newigobosidukopovawixapaz.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/4911a6d66bdb4b792c0cf6ec588cb8c6/dotabigamevakuwifetifejup.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/20104156417.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/61dc3d0e1a04d45a9a4da7321b43c878/tigodedowebekepuvusosok.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//77007776353.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/c624838de71eba1b18d9597d8cebb9d9/75022644805.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=super+smash+bros+nes+downloadPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15529 5536 bytes
SHA-256: 4b5cc1d9b42b6805bfb861033616a8af7b1b14d1c093a00d263647fadb5f17c6
font_01_sfnt_off000167d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167D5 10636 bytes
SHA-256: 82ca5d2e3f7f7b0dbd4dc61868f2768e88ed78a8e05b07578bcdae4cd6613dfe

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