Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bf6d73d218b79d…

MALICIOUS

PDF

84.7 KB Created: 2021-09-06 16:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c24e4ab2a9fa77633728473e2194db42 SHA-1: 0dcd015e7496270e8b84fe8c90e70412eef9e61e SHA-256: 31bf6d73d218b79d7077436e349bb44463ebbbd5bda73c0e11fe58527b8c9df7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and other disposable domains. The presence of embedded JavaScript and the link farm structure strongly suggest an intent to redirect users to malicious websites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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
  • 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://omak1968.com/clients/71178/File/watejobaxonumipabow.pdf In PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/mufapejuwanarodewijid.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/76680613082.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ejf53f2ihlrjcvpmdr58luogqo/38010748345.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/816cb3e3ec90241257ffc1f680416461/2816709290.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/telemewajudotomijoradeled.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9626ddf3e0---46104730516.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/dapezejubom.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/mebesotelorafokegupigizuw.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/zosajowefajabagofukaw.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115574d8c91d---46028011521.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/xidevaxevixu.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/dupuxelosupene.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/71552303252.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a36357b12e9---zikep.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/ribuzebikukilajuvenur.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/e26db4a17f50cd60c70fd7dc93e5f7f8/99522145825.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/80796669181.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c888c20507d---simuf.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/68155623470.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612c2b13ab38a---13495725692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=squier+precision+bass+manualPDF 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_off0000e176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 19360 bytes
SHA-256: 65a02f4e2c42da4ca1b831d832cc8ac8f0dd7db7ee95bca86c1d19c0a1b3434b
font_01_sfnt_off000113fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FA 10896 bytes
SHA-256: 21fc6c7c3c35f8a055bcf24db1db5509dfcb14e58f3b96e14cdf293f302235af
font_02_sfnt_off00012cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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