Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa796459ea2e5eff…

MALICIOUS

PDF

84.6 KB Created: 2021-09-06 22:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5fdeabd1371b24e154d3b2df1555d503 SHA-1: 7d9e986896b7d43294a75cd0650e8e86704fc9f8 SHA-256: aa796459ea2e5effa18d03f8e9c925c595914bfd0db2319a6e68a6e75d324b0f
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5882

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://gulyaskantin.hu/uploads/frontend/files/15385230240.pdf In PDF document text
    • http://auapp.ch/userfiles/files/sugumanirarowegefogalagus.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/visudopakikemetorobategeg.pdfIn PDF document text
    • https://soechi.id/userfiles/file/23192476857.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/56959424175.pdfIn PDF document text
    • http://flexicourse.cz/res/file/68061989343.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089915a74bc4---gomuvuroxapexodud.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/19893482072.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ebb4f418f5f720b955542049e76fa2b0/53246003371.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/pokowonagigubezobur.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161132ad1077a9---mijobimuvadaf.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/77620486420.pdfIn PDF document text
    • http://elitvorota.ru/f/file/nunoluxed.pdfIn PDF document text
    • https://5uempat.com/contents//files/90888366511.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743289c9aed---xorizan.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/32079035297.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/vilaluzirakurugogow.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/b24d67e9f49e40598683e3f2dc9ccc6f/79161953508.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1cbe05fbe---56439697574.pdfPDF link annotation
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7977fef513f0b0aab2049d0a6bce2933/44625057506.pdfIn PDF document text
    • https://naves.cz/res/file/wedudimusitilofofuburobow.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/19899329670.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddf29bdc76---64249384100.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/98910534138.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d5757c5498445409607437bb12e4742f/86768335475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ti%E1%BA%BFng+anh+theo+ch%E1%BB%A7+%C4%91%E1%BB%81+pdfPDF link annotation
    • 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_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF947 32012 bytes
SHA-256: 61054d537b41c27063e4114c7ea26196c0f43ff85ccf390561037bb9784a0b09
font_02_sfnt_off00013577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13577 11236 bytes
SHA-256: e6caffb6bb3a4b116385ca9d3c136847732ccc566ec2011350098e5eeae26a11

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