Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb33d0ec7be680e8…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 20:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f50a800058f2c52a717c479ea0dea0ea SHA-1: f634723a6be59ad6f9da4fad8670d22cf601e3be SHA-256: cb33d0ec7be680e8e7d3eeb228995c1010bd3913fb67e0a6834ac4840f9c1698
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://rustproofingottawa.com/userfiles/file/wajukejujakogilesokidi.pdf In PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/v0hp3icg1uc7vvidkkkf1sh9q1/jalokemamidijumo.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/33070616113.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0922/420b2fad64e5436ce28abfc6b6bdc5df.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/bukam.pdfIn PDF document text
    • https://aurorahoian.com/app/webroot/upload/files/77920604391.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/tewanofexo.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/riwozefaxufuvibu.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615195aca744e---32080689366.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/jepirofi.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/gusakixo.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/dupar.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161525a013ca91---sulumenemegoso.pdfIn PDF document text
    • http://ipceurope.be/assets/file/megepisideginamok.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/pumapenetojewol.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/nixufad.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/fumatazaxugewexevog.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/62951163096.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/63521541546.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/39246505408.pdfIn PDF document text
    • http://zae.me/datafiles/file/puwomenurolasigumikapo.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/gagakirowibaferazurinona.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/jixarabexixiberimonum.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd3fa353dd---fonapawefofa.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/meluvesizaf.pdfIn PDF document text
    • http://gazetavk.ru/img/file/fuzunareralez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=lucky+patcher+apk+iosPDF 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_off0000b189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB189 10584 bytes
SHA-256: 96f419a8dfb82dc6f97d9835f2abd8fa40612ef3b9fb67c59f7a1353fb1e4788
font_01_sfnt_off0000c9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F9 14752 bytes
SHA-256: 2bf1bed0b269669d834426548bd5dda37c93127fc66ab6562e890560dbcf8577
font_02_sfnt_off0000eefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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