Malicious PDF — malware analysis report

Static analysis result for SHA-256 3939c061ab2dd54a…

MALICIOUS

PDF

91.4 KB Created: 2021-09-01 23:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcaee014e7a6a2440148adb3f00fcd77 SHA-1: 4419f3910bcf342899b9ca4ffe3a1d4b3fe32ddc SHA-256: 3939c061ab2dd54a28f74bd082754640929ef558b51fe387b79dc4df30e53747
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://movie2book.com/userfiles/file/bubokulilatul.pdf
    • https://propiedades.net/ckfinder/userfiles/files/lufuzu.pdf
    • http://automsystem.com/UploadFile/file/20210623013122421.pdf
    • http://envisystem.com/upload/userfile/files/40618922168.pdf
    • http://strandedtattoo.net/file/65035056830.pdf
    • http://techbis.pl/files/file/45841600277.pdf
    • https://webaprint.be/img/file/41548273259.pdf
    • https://orangerun.re/photo/files/kubiwidinofiwikog.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088162ab3d70---25088156998.pdf
    • http://arcenevents.nl/site/upload/files/74346999904.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c2f41901aafeb900af1fdb92abebaaa9/61252150824.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/9c93ee00877a34e286b10a1667a9a5b0/worukapulafel.pdf
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/59297810618.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aec712cd0---11053824865.pdf
    • http://artside.org/data/temp/file/53941894244.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/eb66c15d48dbfa8410872d8cbf1aed40/badanufadozomuz.pdf
    • http://fobas.cz/userfiles/file/49465144353.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae5105e38---zinexeviz.pdf
    • http://elektrostroy.kz/ckfinder/userfiles/files/gakoravesujisixatunezoru.pdf
    • http://hkacca.com/userfiles/70965032550.pdf
    • https://biothiennam.com/media/ftp/file/zurebenuwugam.pdf
    • http://sotel-perm.ru/site/file/31662499061.pdf
    • http://kapli74.ru/upload_picture/fitimoto.pdf
    • http://altinay-law.com/images/file/girozefiduwonaxurixo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=10+famous+inventors+and+their+inventions
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fba4.bin
6c7e225872832ddbee62b925f48382a4516422753a1220a7455d59a9eeac67bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 19104 bytes
font_01_sfnt_off00012db9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB9 16792 bytes
font_02_sfnt_off000145d0.bin
3397a8248a5a1e6af56735b8e0129cbec14a5474076fc242ad1da09dda2a3ce3
pdf-font-stream PDF embedded font (sfnt) at offset 0x145D0 10816 bytes