Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e920d1bbe386bf0…

MALICIOUS

PDF

80.0 KB Created: 2021-07-05 04:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 084fd0dd094676f7a7d5efdb758a3ca4 SHA-1: 0a9702670b368ed0deae95f928a2786779dc10c2 SHA-256: 1e920d1bbe386bf02086c11132ff3e0efe32d38920765a22351b4059cf9983da
172 Risk Score

Malware Insights

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

The sample contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites, which are indicative of a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The primary attack pattern involves directing users to malicious PDF files hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

Heuristics 7

  • 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 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.
  • 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 https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/ef18abcb4a22193bfc7a213f4820ca3e/viluratemulazizawi.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/i88ugt1reqj210b06hcgrnav0a/22209241634.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/werudidaporakoxo.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/bipotuzedovajupakuseta.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/2251d00a9ed4ed78b703002b4517665f/denilamezazi.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/0fe4426db0f720dc1c405eecec056263/84068936043.pdfIn PDF document text
    • https://btegypt.com/file/pojabalaridad.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072f1a89d44a---nawunerovekaloronolagik.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/fixivefopekoteditadano.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb85d0cc38---logunuxofonuzup.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8af356ec9---tugeva.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160de5c13ccaf0---44779500107.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/e9q3dcv48c9usftn1eu1m0dhj1/52501493481.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/c525ba3f13a4f10984ebd7f72603aaa5/xebakotapobew.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84f2200261---77839798063.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/trj84vc41jmik5057dv989khj2/89394430285.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/temisexevel.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/7bc1b197ee7074994b8cc1933ed41388/63140276353.pdfIn PDF document text
    • http://industrialdevices.in/uploads/ludakejosirebagijujire.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985ef47f177---13196357928.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/81277269000.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02c812149---rurenuwo.pdfIn PDF document text
    • https://bliznacite.com/files/vozixojororetopugawitiw.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/62411851781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=applied+calculus+7th+edition+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE5 16756 bytes
SHA-256: 14ee85bd099a1aa93ba360e8b7d60dd16de2bd858bdce977df7ac0f4a8f748a8
font_01_sfnt_off00012793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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