Malicious PDF — malware analysis report

Static analysis result for SHA-256 38af0162b53cbac2…

MALICIOUS

PDF

77.5 KB Created: 2021-09-15 18:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb3215b66a18a9bd4b145985d6b1036d SHA-1: be0719b9a80b0c87c06c47f467659e5a53a76e4e SHA-256: 38af0162b53cbac29a123c7db06f71df11983f14ac564c23037fb35afecc897a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, with URLs suggesting a lure for cracked software. Although no scripts were extracted, the structure and URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f589c7db76---16810005007.pdf In PDF document text
    • http://lakesnwoodskerala.com/uploads/file/vidibadux.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/daviratokijizu.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/pozopibebuka.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/jufodufanumupubim.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/89124227334.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613410e50c250---7535873493.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/33596159422.pdfIn PDF document text
    • https://ikansambel.com/contents/files/82822383016.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393eda3d6d4---57112538682.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/lizex.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/58760485178.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/90758657657.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/13330830240.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/64500136752.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613263b4b00e3---vafuwerowanevesabutamo.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/9848304610.pdfIn PDF document text
    • http://cke.hk/userfiles/gazowarezedabejoxi.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/74040770705.pdfIn PDF document text
    • http://platcometals.com/images/file/mowipida.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/95722334035.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/97394662993.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/67087291890.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/bavufolemelesukazeduva.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/75827295724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gta+vice+city+crack+apkPDF 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_off0000cb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0F 10240 bytes
SHA-256: 735a41439c182900d8b392c267796209745ec7fb6f987e2084505196a9676843
font_01_sfnt_off0000e249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE249 17688 bytes
SHA-256: ab8662501a4097d41a601015f323cdb72ba29520f53beceb15133e966d13911c
font_02_sfnt_off00011057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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