Malicious PDF — malware analysis report

Static analysis result for SHA-256 3508230eea8adf88…

MALICIOUS

PDF

97.4 KB Created: 2021-09-08 19:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 700ce108d50a488aee0b2929e066a986 SHA-1: a9f94ac9215595d8a48e0e76ff7b456c4c8bc0af SHA-256: 3508230eea8adf88494a70ac9fe391a5f24b95508d2d11e2c004c182673cfb4d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://c2ctrading.org/cms_upload/files/11552526190.pdf In PDF document text
    • http://frangarcia.eu/upload/file/fetudibigepinanu.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210902232149.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/74595995763.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137402a6e32d---29755814403.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/81738625121.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/52199160820.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/siletivawamapo.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/89633887644.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/zolixiwuzokirerujorasej.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/20566918330.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3308309403.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/roveboselituwex.pdfIn PDF document text
    • https://kuepancong.com/contents/files/36267064943.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/87033075518.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/46026499996.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/siwemafawuf.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb936e390---28711153559.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/kafusumefoxanowurogasaz.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jijufed.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/webirunitavebamufirubud.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/buzopogimamunenugidem.pdfIn PDF document text
    • http://3q1p.com/upload/file/210903234546197002fvdt0jfcwvdz.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/669d8705b3908d1786a6d22b3a02db83/27896152976.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/xiwusudowepefumizozug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=nd+football+schedule+2019+pdfPDF 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_off0001151b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D32 11100 bytes
SHA-256: c9b7fb69b9579879287276c39e7ca37a13e00244211ff7d889b6a0c59cbb0d56
font_02_sfnt_off00014721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14721 18376 bytes
SHA-256: 6abe5dd36d0b5f07dca71cb6662c3f12468502807a13acd550db05be4244bcc6