Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31be8c3065a3de6…

MALICIOUS

PDF

84.1 KB Created: 2021-07-07 16:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d76d89319e1214de0650c45624eb806b SHA-1: e6ceacd9f5b1edd7591ed7f9a60958590fbe1b27 SHA-256: d31be8c3065a3de6f550dfcffe5fb3ad31243ed93e74e2d5e92189843753eea2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 https://chcial.ru/uplcv?utm_term=kappa+face+text+copy+paste PDF link annotation
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160805b2b27b10---karurolusuporosomibosinu.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607115fa9a8fb---luzoxotorabiwidiruzata.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/051812485688.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9dd2099387c1520e183146d155d676d5/nawovizibotis.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b402c544a---mufupajivupila.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/lajanidiwaxomomuw.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/jabutotajelasofeg.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/12701798855.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/xuxebab.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/m116bdhsf3ijo96s409u3j076i/xepugiwulapoboxutiredetab.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/xetapu.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/17a1dc3bcb862aaa9a700d82defb1990/39536615671.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/loxegorujalewu.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/28884709806.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/risaxazopuzaseweli.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a622f56089540941e8b832040d2d0ca7/27859398294.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/34656693564.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/6203087588.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/xuwiragakikesikuzewilu.pdfIn PDF document text
    • http://jar-ted.pl/file/23135999561.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/7701120278.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/d0n86m8p210uv28cktj3d2953j/buliba.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2a860159c---2754108554.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c51eb8a7d---42631680945.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/b42049be0b18c30f02cddf48650a2498/53752092358.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC59 16172 bytes
SHA-256: ec4a23e45ca2958ce710d13f36d1b321b0250da795652cd1239d181e89b1ce51
font_02_sfnt_off0000f1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 21820 bytes
SHA-256: aeea7512ec6cb44b44e52d183ecff850a1e53674985cb8ed5d80b66931cf3b87
font_03_sfnt_off00012960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12960 10336 bytes
SHA-256: 9131fc7e0019fd413e2149cfb262d7b5accd131964ed5ca1fc217b00fee3217d

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