Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7501788d20eee73…

MALICIOUS

PDF

68.1 KB Created: 2021-10-03 00:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d0add79fbd33701270b5be90d2041a69 SHA-1: 1bc47382de85c3776774595d8ca35c04961c3a8a SHA-256: e7501788d20eee734c4b019645a56a13098e33a31a86125363736c3602564d3a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution vector. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the ultimate destination and evade detection. The presence of external URIs and a link farm structure strongly suggests the intent to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://neboskreb-irk.ru/uploads/userfiles/files/37662138641.pdf In PDF document text
    • https://machinex-machines.com/UserFiles/File/nedagedinamawusudasorepoj.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/82630081154.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/jixugisidexazuxejudilir.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/157e8278bdcbb551156e07f5b9571fa8/gebugodebivanovikolobazan.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/mirixo.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/tevobir.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/wudenufilibemedomila.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/54936079576.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/zorijimagebipotafitax.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f40446a98a---biviwe.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/f4ef6f0482d54fe07ea0af0e7a1d7cdd/vulopulobuvixili.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/4109994225.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/naberorusagutunur.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/gopabuwem.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/puwedot.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/denatexovujetidowupanalo.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/tilepateguxujami.pdfIn PDF document text
    • https://1am130r6h1n1-k11a7.com/contents/files/takomitemufodat.pdfIn PDF document text
    • https://strechybenesov.cz/content/59057600353.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/zuvigezolizipajivimotub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gerard+way+quotes+about+lifePDF 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_off0000ac80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC80 10868 bytes
SHA-256: 87911469c1b80b0c897e62ac7ee17989ae364e6be165d05e8d386ec99601912c
font_01_sfnt_off0000c59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 14808 bytes
SHA-256: e282f91b326bb09683be60cd842f7febf55c5326ffa3b386ebef3affd8f88f3e

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