Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cce4367b5cedbe8…

MALICIOUS

PDF

79.4 KB Created: 2021-09-04 20:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 29c3c46e36b048bcd5fe20a3751683a4 SHA-1: 645ae2e5a38dc2775ae16e5b3f234f33b7d254d3 SHA-256: 5cce4367b5cedbe8a20684f2e321dae50711217b0559a178ed223dd6129aa6c9
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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://hohsingfiber.com/ufiles/files/sixer.pdf In PDF document text
    • http://ebslang.net/_UploadFile/Images/file/gawelopexanivezuwimil.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/30998711725.pdfIn PDF document text
    • https://birudongker.com/contents/files/43065545670.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/41840645720.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8b2113e7d---sonozakupuzim.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/jivafi.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/26006833777.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16097cf3cc0802---felojux.pdfIn PDF document text
    • https://blokhol.com/upload/files/zukusoveturojunojedukoke.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/85923280982.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/59504650233.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/63944296324.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/2f8md37dgijq9iad3qd3o1ohoa/gabuvupo.pdfIn PDF document text
    • http://citra.cl/userfiles/file/74012996972.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/fudom.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/op7dar9t1an83lk8q3saiio480/resozup.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/31311621512.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c18ae5d214---87956162869.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/82fb746adc307ec6fa47f25488836dac/11862319925.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/nebiveges.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/guzebugavovenabunogasazip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=preschool+english+language+worksheetsPDF 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_off0000cd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5C 19712 bytes
SHA-256: 6784e923dff6ef0d1a06c90d59bd4f8c5583e29d48c72218abed2037b73d88a6
font_01_sfnt_off0000ff14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001172b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172B 10788 bytes
SHA-256: e91e1fe50abac1e82a0dad488276c6656eb2ba488005db4e15dcc78911378afe

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