Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4ec86011b4b0c1…

MALICIOUS

PDF

78.4 KB Created: 2021-09-20 17:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e81fc9af0d9ec316aad24641906aea01 SHA-1: 628ec44269750a03a62731af47fdec980435f442 SHA-256: 0c4ec86011b4b0c196881a2367312cbe8f27200476fc7528b5d1ad23ee641684
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://queure.ru/uplcv?utm_term=bubble+shooter+bear PDF link annotation
    • http://zhouzhuanx.com/v15/Upload/file/20219181848463311.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/48964787579.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/2cjra7hcennfri4dfc2koppfgt/nikopab.pdfIn PDF document text
    • https://ms02bet.com/contents/files/93986269996.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/pidisujorit.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/79082591814.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/zezuzur.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210906020633.pdfIn PDF document text
    • https://basisangka.com/contents/files/21725432604.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_19_02_12_47_2936.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/94072272849.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/42297379966.pdfIn PDF document text
    • http://teraval.cz/res/file/gukowavelujut.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/43572007786.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/wekanekumozuzezewugotev.pdfIn PDF document text
    • http://rentaruedas.com/files/others/52239069831.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/terajidoliva.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/1350056404.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/89643962832.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/zikoxonav.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ffa093ad6---nomafevubaledudemi.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/36504983587.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161348520344ec---fokuxiguvuvomanunodoz.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_off0000d148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD148 10300 bytes
SHA-256: 5f0b3cb243c401d158ec40fccc4384a1f08187c477b1c046d159371400f85721
font_01_sfnt_off0000e8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B8 16716 bytes
SHA-256: 3e0e0f78f42544f2dbc7517145a46514eac6aa2c5994b369ddcba2c28a57b1e9
font_02_sfnt_off00011439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1