Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd7cadba0d41e19…

MALICIOUS

PDF

71.6 KB Created: 2021-09-20 18:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1bf09bc27855c237851dd89f4132918c SHA-1: 571357c52b8d46b12d69b260dc8841eb92919451 SHA-256: ebd7cadba0d41e1907b505ebf68243d929bcd366e1033dad9243dd4b6f763c94
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites and disposable hosting, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous unknown URLs suggests a broad campaign to lure victims to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://sjzhtchem.com/upload/files/jufebuneforufe.pdf In PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/tuvidavawinu.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ab1a182e---86163901200.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/risilarutuxarudigo.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/44816869226.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/7517854141.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/45254819152.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/91753023257.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/zelosafojubolow.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/xexoredanawaj.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/77811481657.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/tonekorurekukadi.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/50071347797.pdfIn PDF document text
    • http://metabolit.ru/files/file/42414819882.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614499fa9ca3b---lizapenesuzotibofewi.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/pofowojofenene.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/sedagefomexozofiliwomi.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/35589597131.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/mapivegelati.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/17508589843.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/37736075407.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210901_FC1873F0730FA693.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/fovebetijit.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/zuvipozinurun.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf859308d---latulexebijofikimurilaren.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sms+android+messagesPDF 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_off0000b782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB782 16296 bytes
SHA-256: 5098ae29f762f3741117645ea3ce4544fb5c8859b50b6f3ab08e3cdee2233cdc
font_01_sfnt_off0000e150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE150 10520 bytes
SHA-256: ec5afa47fd6313e5f7794b0bbddd5a62a6128cb9252840f6794e3ae8f8527208
font_02_sfnt_off0000f8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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