Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4b9f76d205d3d6…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 06:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63446c952a4c0205b197ec9dbc687a66 SHA-1: 4b2e091557933b0706af54b7ed5ea1ebe280f59d SHA-256: 6e4b9f76d205d3d63dd39230bf5388ebec33fee6a1b25f6dbde77963a56b65d9
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to compromised WordPress upload storage suggests it is designed to exploit vulnerabilities or trick users into downloading further malicious payloads. The primary attack vector appears to be a phishing lure, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 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 https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/41874761739.pdf In PDF document text
    • http://europavloeren.nl/siteimages/file/gatixafawevanasusiwomuki.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/84973917111.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f9c4322dd4204c18abb37e73cce17c2e/xituzuzikufome.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/2idquh8dg91ov0vg08h496m874/39368227850.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/mimixaregubabofirof.pdfIn PDF document text
    • http://chieucoingason.vn/files/53630160819.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/9daaef64dcc524eb8190e378da1d593d/patibopapadi.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/22e54f6edbd31b71691173b97286637a/75318663669.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa6ed496c5---zasiri.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/2ba7e14bc3112590e9009ffc29a7a566/wudutuwafuwujuxekodavira.pdfIn PDF document text
    • http://web68s.com/upload/files/3533421599.pdfIn PDF document text
    • https://clubon.top/uploads/files/bejumatojapatepenuk.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/fefigipinow.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/80015665952.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/17590485827.pdfIn PDF document text
    • https://bursac.net/userfiles/file/zigaxipogunuw.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/ximopabidadalejob.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/24276092498.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/55116082613.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/kesifikigegejerifigima.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/dodawomefoniwuzesimilaju.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jefujumipijekarav.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/31nnnv0hgmbrdkr0gu136aaqfq/kiruzimaxilijefobopixix.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/26318318281.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/nunixomenasoturavovip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=classifying+matter+worksheet+1st+gradePDF 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_off0000dbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC2 16912 bytes
SHA-256: 7e4ddec4bc1dda2825704a8c91e9abc48396b530746b2961c43918fe4a4fa4cc
font_01_sfnt_off000107dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF4 11176 bytes
SHA-256: 2dc046409ac775a2bf6cc14aa3906b2aa976c6f8d60b8d2b629850191dedffb2

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