Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7fe39487087bd95…

MALICIOUS

PDF

94.2 KB Created: 2021-07-05 02:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6b78d9ea9c7a33c24b4c545fed0d0096 SHA-1: 8513cd9c1ade8746b9ec2968f9dd9e84d93158d2 SHA-256: d7fe39487087bd955aef79b79d750d64f972f8e20fe98e3eabb7f84a314ac49b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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.
  • 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://paoladebenedetti.eu/userfiles/files/9938764830.pdf In PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/darug.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/k879l0kj19ij58sgb79ku2ipdi/dujolawutibikel.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e46e2044---sojakonilizemipikula.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a55d3901e6---xokipitadovepumogusawaz.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/wavagebiwebabu.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f92b928b4---850490507.pdfIn PDF document text
    • http://learningkey.org/userfiles/genomujuputupusigima.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/56f58961a6679726bcd24b3810471f8b/gotinume.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/lofegabok.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/37468286767.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/f792ca21208a7856d24be50b2bdc6c4b/73713314840.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bc9a79913---dararilotogedosedirosuvil.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/burakasosivibufep.pdfIn PDF document text
    • http://www.celso.org/download/lekemajaxefevujinisidow.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/74792938522.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/kuzovifogexibe.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1756cd8ce---87347376716.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4b0ee3916be7c74f3ee405e4ae0ed92c/rijemedorikalerusujak.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c607548a---botuvinililuzaxixiw.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/82c6vbabvbhqboljf5h1oiuhq5/jewaravogap.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/n62hpe2agdtv37leoa3fr08t2o/16857829795.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/2rho53h8bva46qcdio9t5v7151/taxiwofewanoxuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=is+taught+a+verbPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F99 10280 bytes
SHA-256: 94ce18e191459a445049b666599abb05447c99652707331602516cb970e2c7e1
font_02_sfnt_off000126e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E9 17864 bytes
SHA-256: c5358f6e990a7c6da5434493a53d7dfbc37614f6953fb2ad17dbf722133169fe
font_03_sfnt_off00015581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15581 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4

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