Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0d61353f84bbe1…

MALICIOUS

PDF

69.2 KB Created: 2021-10-02 19:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1af08ea07cdcfdcdf8d352c174896958 SHA-1: 7bfcd5f37f538fd714f45e991003fdc24e275fd6 SHA-256: 4e0d61353f84bbe159fbd21e5153e039673f85c4fc58e6deb7576821e31a4795
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs, many hosted on compromised CMS platforms or disposable domains, indicating an attempt to distribute malicious content or phish users. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://chinasoftcore.com/userfiles/file///6778500372.pdf In PDF document text
    • https://trieurodata.ro/images/file/9032558329.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/dozuresuterajepadiwa.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210912_9E6F0091E415C2FA.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/48300607609.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/nijejirulaviguxuxumonudik.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-10-1/20211001033836860575.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/1em7ctrh6jekjasi5km8qdv5dr/zaxelesefobovuvari.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/13385286258.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/rizafogorigi.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468a67a0ee1---rinifolakadosewigopanu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fab889d111---motujipevuxibowiger.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/31592082051.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/13943114447.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/76110526068.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/somuwevupug.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/wogabasagubupowofisu.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/tetexuliseneme.pdfIn PDF document text
    • http://ccshecea.org/upload/files/lovunopowasepevede.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/24252194349.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/47229455007.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/76052258548.pdfIn PDF document text
    • https://webmenuplus.com/images/file/59271510135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=taling+chan+floating+marketPDF 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_off0000aeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC711 15712 bytes
SHA-256: c8fb5ad5da75fe9a2acce9c5f40d073fd0ae1b66553f175095e6a924f54d0e25
font_02_sfnt_off0000ef46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF46 10668 bytes
SHA-256: fbb1dbe4492f058ad9300558258121762dc31152dbce59ef9e40e0dcfcd8098c