Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8b7b325825ddc6…

MALICIOUS

PDF

86.2 KB Created: 2021-09-17 02:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: daeef5fe473d09bfc7613bfbcd3e8dd9 SHA-1: d841328c70a5c9c48b287e23273b4219dc62b41e SHA-256: 0c8b7b325825ddc619fe57d4a54297d0b0964301550636f2b665513209183c5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, with several links pointing to compromised WordPress sites and disposable domains. This suggests the document is designed to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=how+to+run+app+on+rooted+device PDF link annotation
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/38847932152.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/60720690739.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/totozisidawoxuvoz.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/62194406072.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/3302079b30d84b7ead498f66ff7361e9/mojeborixewipezukalezi.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/pusuxesod.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/jagisozawamowekurewo.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/72116887357.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/9847184212.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/jufeniguzefumaro.pdfIn PDF document text
    • https://preciseenergygroup.com/media/67625248714.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/85226594892.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/zugem.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/10557929532.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/zilozubedagi.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614102742086e---10328459795.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/molilujokized.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/47591222290.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/78131267826.pdfIn PDF document text
    • http://arablift.net/userfiles/file/tasuxegaremugamivuxi.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/sedonedux.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/73817292886.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/zotiresowegonirokogerin.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/88aa41496dd35606466e3ff0c9b84035/362339410.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_off0000e96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10180 19156 bytes
SHA-256: 69c4682b123ade4f7d6c58d8843655632bf50393b836a0f69b58875c079ae70e
font_02_sfnt_off000132be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BE 10536 bytes
SHA-256: f927f2d171303023c4789b85a1a62691cc65dbf1196874694d6db67bbf7a18a9