Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1df0a0083c60d2e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 15:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 9b8a47a47e4e783312df0483bbf9a72b SHA-1: 0371006786e35f1a9b032a06d9263d70775b5879 SHA-256: e1df0a0083c60d2e26e612621e4625fde4c9b8d00aa607ac2f42dc39f1919db9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pixomot.ru/uplcv?utm_term=cot+24+degrees PDF link annotation
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d43b0a0b2c58e19520a94aaf5b882f27/bazikavum.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b53e47d836---bujajo.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/96085137354.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/8840005670.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/e7ad152b147f6886ab23c6e4e06c9a88/16695898599.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/1033806689.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/darox.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/7608681478.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/wiperesokukinukel.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/lasisavojun.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/nofixibeguzofu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c261d3847b4---vazipajijunot.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609056e013303---10806330664.pdfIn PDF document text
    • http://adveotec.com/img/file/nawabibalajifamupat.pdfIn PDF document text
    • https://yasacompany.com/upload/files/83170343437.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d2949e7ee0cdbedacb5b81ccf0da2e09/sufigolafovoxovitu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160901040ef11c---52218667248.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/33342929626.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/64721456457.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/84109000914.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076702642fcd---lepixonipak.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_off0000e3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DC 10248 bytes
SHA-256: f0cc8e09cb455c3b25978130c118fb00abb67b768b79d47f388399aa20e3e41f
font_01_sfnt_off0000fae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE5 16852 bytes
SHA-256: 7102dc71aa5b417ba9dbf882d0ef901e3cf1754761eeb0e5951a48ccb35cf66c
font_02_sfnt_off0001267d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1