Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c2fb1123d5d4099…

MALICIOUS

PDF

83.7 KB Created: 2021-10-14 18:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 865e10a1c7c00850e7c3278a128829fb SHA-1: ced9267c8567aa232977ab60ca4d2c770193412e SHA-256: 1c2fb1123d5d4099148eff0b3dc356edab9bf32c1676dc2cd29480d3dcb4681d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the URLs and the detection names imply a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://saleskerala.com/ckfinder/userfiles/files/komanawejatoxosu.pdf In PDF document text
    • http://bielle-srl.com/userfiles/files/vixijadetevesi.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/87926873657.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219602832.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16167673fa3c38---95313763631.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1633485521.pdfIn PDF document text
    • https://fultoys.com/userfiles/51566147665.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16159f465208e9---46308991871.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/18825987536.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/sedaninekupabulim.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/7688998702.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/3513440768.pdfIn PDF document text
    • https://babamansurkurhuseyin.com/uni/yuklemeler/file/70377727648.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/zosolu.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b5c98befef17ac0d4afe2276b3003e36/tafezujesebatidadopek.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/paguwuzalobew.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/b05ba29c45b40c8b7cee642ea508aa0d/gotuwijizajazofotopufu.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202192725315.pdfIn PDF document text
    • https://iword.de/userfiles/file/fubaj.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134c40766723---letisik.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/25435667730.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/39811159562.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/60622462840.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/86331438934.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/23263514421.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/74474696493.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-21/20210921075814305519.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/D9plVHj2VOU/uplcv?utm_term=best+grind+for+percolatorPDF 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_off0000ddb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 10848 bytes
SHA-256: 00142af5801bd773cef075d87b823fa4fa05c07ca01b8018bc15a6c74d37499a
font_02_sfnt_off00010ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC0 19368 bytes
SHA-256: 2dd9fce403fa175ac71bb72a33ffd39997beb3999789b1f4f77769c7b46e7c56