Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efb1dc59eaa64cc…

MALICIOUS

PDF

88.2 KB Created: 2021-09-16 11:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 37bfa5fa88af45410b73ddb0c38cbff4 SHA-1: d33ce6eb6183b9c98238413c53855ba3e660e463 SHA-256: 4efb1dc59eaa64cc5f0108db1814eff64a7bfd6f9543ee23ace4bdb88eb34578
156 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to phishing sites or download further malware. The presence of these links and the overall detection by security tools suggest a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://st-johnson.com/Uploadfiles/files/16441332588.pdf In PDF document text
    • https://millinerandassoc.com/files/file/lawupoj.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135cce65cc19---fumexisenuvisizitimelelow.pdfIn PDF document text
    • http://ellev.fr/upload/files/virularusififemofomekagiv.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/lozenen.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/6539934931.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/169c7ecd0971dce02c1683232a50748f/tobepavabubob.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/vopexeserir.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17282325106.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/mazelawapuwevozobu.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210905_065940.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/vobaxe.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/dopovirogux.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/92369576959.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139b50c6a0da---sosexajasavijesomufetuj.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/duwevikematumovivod.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/badisufufib.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/ea516dafa78a7efd2be616ffbee4462f/fuxijipigipajefenanoneko.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/68466919668.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/boxezopoxikipapa.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614091e2ad577---kizuzunan.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/texileletulixekuxobog.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/migutoxu.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/eff9e66d12a35acac5606dc180bae334/22088408777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=oneplus+one+android+updatePDF 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_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B60 10508 bytes
SHA-256: a42fe9608b6893ed4a55539868df91f7461bfcac2f69322664cd2b6fd911621e
font_02_sfnt_off0001235f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235F 18444 bytes
SHA-256: 4b309ca0ab262b7b68cc22dd0c2fc462becce38acbd093b6fb6a9bee8fc322d4

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