Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e30aad18c4accc…

MALICIOUS

PDF

70.5 KB Created: 2021-09-06 20:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ce0a61cfd27ef1f8405f54e22903598 SHA-1: 4703c865934d4e194664427bfe14acc29205c6d3 SHA-256: d4e30aad18c4accc05156af7d3c3147b840c9e190adc1095c72e9e06a25e3b8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=philosophy+and+theurgy+in+late+antiquity+pdf PDF link annotation
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/t3vt3v234t6ppvflkbsrbl77c0/84374913325.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/67217139885.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/toxogokekelafisigakigovaz.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/bedaniloruxujevumavezid.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/601ca8c2bfbacd50ed5ad0a6342f9f2b/fakikatoroxajifodex.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/17136558134.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/6bf2da34d33030e2f1971f72a5c1617f/30373185996.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/74343873071.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/87606678280.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b9e0a5b15---motalijixijigok.pdfIn PDF document text
    • https://capecoralliving.com/media/file/81869573321.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/vamuk.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bowipevur.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/vezewefenotezifo.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/kagesomewakezu.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/gipisunizuwetagerebepev.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160996b24d6ed7---3453719256.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/09fa71f41520ce707af41a546fc943be/juwupixepafezasaxum.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/5kre8suapr9g3fghsahac8c4q5/67396601721.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09ce23173---74980449890.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/9faddc34f9474e87c283495c417759b2/jiroxogalekelujesupu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609708f155831---59235299187.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/nosesovazovoxum.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/depude.pdfIn PDF document text
    • 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_off0000b4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE4 15004 bytes
SHA-256: 789070edf52e14ab156b2100a210e6b51bb181911c138dee76e899a64138fa11
font_02_sfnt_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 11140 bytes
SHA-256: 9e218e170be750909a01d3fe6b03b721319bfb88d98b308f132f1b29692a4e82

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