Malicious PDF — malware analysis report

Static analysis result for SHA-256 47f46bd612dcd451…

MALICIOUS

PDF

88.1 KB Created: 2021-09-07 11:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3008dc0f3320ef948e4adbc56ef0ce5 SHA-1: 502e71c0a16693e04205a3bd18279d715112d839 SHA-256: 47f46bd612dcd45119cd87db0ac7d930c818f6ed9cd39f062292e3090ff0602a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing attempt. The PDF structure itself is heavily obfuscated, and while no scripts were explicitly extracted, the presence of numerous external links points towards an attempt to redirect the user to malicious content.

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 https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/452795bc9728b0abf3286d3932e1cb42/tidatigejotoburotipajolaw.pdf In PDF document text
    • http://tianfonmm.com/d/files/61277750717.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/80193418218.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/ab52a59701d321f5142e6403dcabde2e/kokejikosugexetasamusuto.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/62844640248.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/serirepira.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/kuzakupo.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/892d617ed8fffc8a2f8f074091712130/varujofefaronatol.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/fidomijuririj.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/7mi3ue96plh9ui7fs0p1tt1a90/tuwozavogelekov.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/33f22a9cafdd8aed7c1a5d2e594f18de/66049494480.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087a15818127---3174169147.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/ad34dd7ec4933217a7c0a9ac518cd3c1/62539812461.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/39138112327.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6df994cda7---gagusekidus.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/32356648234.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/lezogigabanajutubox.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/gololibuso.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/e49fa26d3253e3af6915bd846edf034c/tusotaboted.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/27209284587.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b80bae360af---66463467217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=kufa+na+kupona+pdfPDF link annotation
    • https://lapdonline.org/file/33338777776.pdfIn PDF document text
    • 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_off0000f73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 17520 bytes
SHA-256: d9523da92455769f955094ae93f94054212a73a7b59b76bf71c92639ec635c2e
font_01_sfnt_off000124d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D0 10036 bytes
SHA-256: f04517436350457704633d3977c9ce2f99b574cfa208f8d4eb22346c86f5c1c5
font_02_sfnt_off00013b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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