Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd8b70f6f2b2a1c…

MALICIOUS

PDF

88.4 KB Created: 2021-07-06 11:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3efd5964abcdf9a5f83c9fae3ae8cafc SHA-1: 535c36159e4ea141f6c52b7a03163b900c014c72 SHA-256: 3dd8b70f6f2b2a1cf8f79afda01d80d9ac04f61c6f2f7bc1f6f7759738c6c1e4
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 upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

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 http://vizugy.hu/uploads/files/sivebedabubalovisu.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/7788a146cfedd4b349f9daad79a27568/40557283827.pdf
    • http://nmglyxx.com/userfiles/file/75392880580.pdf
    • http://texmet.pl/userimages/file/53999507947.pdf
    • http://daonshop.com/files/fckeditor/file/67190650996.pdf
    • http://podlahypilat.cz/admin/file/penalibiwoloxe.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072630f55ab1---86520730732.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16081921ea7d11---61831992923.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd47655237---papefam.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/a5bmev3ldkvsb13ia8q7p69v3f/27355354038.pdf
    • http://ordineveterinarivenezia.eu/userfiles/files/digesuxanon.pdf
    • http://kemenyseprosiklos.hu/upload/file/dalow.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/uql73d287opeooc8hmntjus7a0/xuzenubumexelewemanexo.pdf
    • https://peterdegendt.be/file/96103994469.pdf
    • http://fszhenjia.com/upfolder/e/files/20210606050021.pdf
    • http://dambi.pl/userfiles/file/kamagurapivonowelowunowez.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d30c9216e4b---48830891426.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/86755341992.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/f7f9cd5adc2cfa71f2b06a2a7fd8ef0e/gelawawa.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/c474d704fb446493c4ad0395733f55c5/sezibebiwugum.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/ehtpffhusngsb462c593q0eor3/dojileguju.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4d6674bea---71080116727.pdf
    • https://catbasailing.com/upload/fck/file/13339526063.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9a2e4bc2b---97657236588.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=funny+christmas+one+liners
    • 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_off0000f825.bin
524fc72c2432e3c36e656990629fcf271b6879fc180d1b5e6ad1258823d3195f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 16864 bytes
font_01_sfnt_off0001240c.bin
96c5dea4da93837332521568bee917727bcfe61c3f019bb844c6cb2ff0a37884
pdf-font-stream PDF embedded font (sfnt) at offset 0x1240C 10684 bytes
font_02_sfnt_off00013c63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C63 16792 bytes