Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52c460850908a3a…

MALICIOUS

PDF

95.0 KB Created: 2021-09-07 12:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 900718784094558db157ab77a06249a6 SHA-1: cb010dfeb850396d7e4c7cfeb02b18d2eb680350 SHA-256: f52c460850908a3ad4c90ed9fec16c0e2360e9e1cd2530ffcb92c85e26d6209a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links to external resources, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the intent to trick the user into downloading a malicious file. ClamAV detection and ML classification confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/b3bfd931d7fb6cb9a3176c9aaa5163d8/vilebapodabanu.pdf In PDF document text
    • https://soudurelauziere.com/upload/editor/file/31889153059.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/e813a8574033c4b425663752a42fb7c9/88478743817.pdfIn PDF document text
    • https://medpressa.ru/files/file/45417673667.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609246ffe9bcf---nerutamasat.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/kunopag.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13e486cd2---neserujagej.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/61666720059.pdfIn PDF document text
    • http://exosushi.com/uploads/files/mowolukanusima.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/bukusifezebul.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/54739654012.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608585bfb8bbd---bomoxefox.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/pipakamokurizobifudinoj.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/e4a7b02dd4d9955b2f7aa82869c7da9d/nizibevasulazego.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105091949014417.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119607203351---16032527025.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/sumozotosozom.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/47827477721.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/vuzamevaduzupezawida.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/289289891.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/tabidifenerujazapif.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/dafee831c8c2dd98d4aa01f0309edc3b/24628705732.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/98217682204.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160816c5a7286d---guzinogovakobezesufadumeb.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08fe237e15---zugexutulipimoduleza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=peavey+vypyr+1+manualPDF 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_off00010ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 20304 bytes
SHA-256: 829ca2ec89648c409f67f4951b0d1d58cdfac08b9bf2deafe43353ac429e1532
font_01_sfnt_off00013f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F70 10268 bytes
SHA-256: 0a5c232c57531b5dcc986f36319411b46db4903eb97ccdc8879a7245962b3171
font_02_sfnt_off0001568f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1568F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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