Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b2823291f3da5f…

MALICIOUS

PDF

155.5 KB Created: 2021-07-02 16:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8374edd7736a28a751cc248e70d0c6b SHA-1: e017c525c6b360506f74ab0e4229ca74c09a8420 SHA-256: e4b2823291f3da5f285a84b53371f8e2a73506f055269cfe06d7ecdd833663b2
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites hosting other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of link farms on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c16e82ec81d4534c2d9ae6a2b76c5865/rubazibokupijowotased.pdf
    • https://allmassage.net/upload/file/20210521044901.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160defc551138a---musatoxabukufovuze.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/gufutazujobofanodoxajaj.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160873ab9b3848---30652256960.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d06efb126b6b4a6e36a45db9a8903591/naresukovujilujal.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0524c1d2d---jefekopew.pdf
    • http://ferrogep99.hu/static/media/file/wazem.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7376189513---buwonemojudupebux.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071387c529bf---69662058290.pdf
    • http://dailycan.com/userfiles/files/38563758589.pdf
    • http://toyotaquangninh.org/data/dulieu/files/16699408237.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/686383353d7291fb1993b05e5b20a01d/94694355793.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b003a3829---20567940032.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dddda1011d9---44322308107.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c5d63357a---nizefagemadafulolexamesaz.pdf
    • http://diysmart.net/userfiles/file/zasutuladapixetelo.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/0969cb793c69084d676c7b786dddb143/welerapibikisir.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/shcjr8hijaboil62spccie20t3/marodirepapejavuxif.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d03ea42fc6---12204864993.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/pa3phs713ghqg9s9u4mim7eib6/49997324399.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609412c7444b0---73079853495.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c10fa906664---10758443195.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/8c145c6e0f23a1f71f99a4f563696d84/36668409353.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/573fb271f71805c668bf4bb6392106a6/fojimu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+force+awakens+trilogy
    • 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_off0001fd95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD95 16792 bytes
font_01_sfnt_off000215ac.bin
1e5f555f36cacf1204792f826187f82cfd3ea08ccef4602f01bb8fc62577aa55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x215AC 10868 bytes
font_02_sfnt_off00022ede.bin
9a5452c32f20f419d3e422d86af579b0c00e620a95db21e2790b4a02ac020713		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22EDE 18648 bytes

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