Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f293d754dbf327e…

MALICIOUS

PDF

65.1 KB Created: 2021-09-13 14:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fe25247652e0fa01232dc5acb7129ef3 SHA-1: e518bcc83f7f24bbb78600921dd0c59dcbe6d5e5 SHA-256: 4f293d754dbf327e9283c4c3e5e613986f2264730fc0a3cfd0e6dfb0f0f0510e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, several of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7082

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://graphicyazd.com/ckfinder/userfiles/files/38784567098.pdf In PDF document text
    • https://ebooksweb.net/files/file/pijer.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/relupojagumumadazinega.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135c08442d4f---wefabudevoxuza.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/91678126956.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/16475144898.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/xesek.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/rolovalitufidodudofa.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/d075ed924cb2e34517360b701e1d831f/gagemadiwibajiraludef.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/namotonavito.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/qupl6beip5akjm2jdkbmnhifb5/zumaxa.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/93112273823.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/nodenipasezosipalokelewe.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/65402572186.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/rogekekokugodelo.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/81152578245.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/rulivomubepazegipeb.pdfIn PDF document text
    • https://sambelteri.com/contents/files/kegujod.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/48752952795.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/tobafepa.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/lifugudasusug.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/mujobolawowagatekolipag.pdfIn PDF document text
    • http://toroisg.com/public/images/files/rebapalagujezej.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/beruxaroravonutaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+yellow+wallpaper+and+other+stories+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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