Malicious PDF — malware analysis report

Static analysis result for SHA-256 826bcfa5b75232ce…

MALICIOUS

PDF

99.1 KB Created: 2021-06-26 16:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8699bffdca7be5aa484ab5169d5ed988 SHA-1: 8ad9047a1e7aa5df0bd8dd0c8f103ca8a48480b9 SHA-256: 826bcfa5b75232ce7758ea7d1caadecf5c892b6b571b0cccf9e89a3687e33475
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d363634102afeae10b92d0da8264c496/vevonetelakemubav.pdf
    • http://adamlegal.com/userfiles/file/sepewewejonuw.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/108ggtm6ltset9o2m253go1ta7/jabebodi.pdf
    • http://dalaichau.com/files/47118586787.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8n6o6as8kp2ln2f6ginp4r501f/61470311804.pdf
    • http://alwaysfavorentertainment.com/clients/879371/File/6531903055.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/eab6a2ee242f5066b33151baf540ab0a/sunupoxixifixesilame.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/e977279b6ee3e120ed4ea44fb54cff3e/76429023109.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/mnl3j89o1nti1daamajtgsp5iq/11041041461.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774c0f02389---tolivuxedanotexude.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/bebef91b78f58365a834696f0c32418b/godufivux.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16078bbf6c3bb3---lafubunuboxifi.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e502b158---79385343634.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/7o539bab2v8gkji3e6132nijp1/61452744270.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608178f9a68a8---pelujorifemematobex.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab995145cc8---73297975915.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/gatogiduzir.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072947da8bcc---tekisigaruguxakixas.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ioh02ut9n2c6ndirkocemg86fj/20162419988.pdf
    • http://beiwendq.com//data/attachment/file/luwadurukoteritawolegebed.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801ffc2e7d8---35446393326.pdf
    • https://atamergranit.com/userfiles/file/14475614110.pdf
    • http://naturalmis.com/userfiles/file/nefosekerakinen.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=knowing+bros+superm+eng+sub
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f433.bin
de8abeff34588462e20f36e1d313561e7a42b00f48e928f589df773c95944b4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 17032 bytes
font_01_sfnt_off00010d04.bin
96ba44ee9d6fa1709d00b00e5fd2b8b3c84e240f2f473cd33418c49a92d86b61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D04 10604 bytes
font_02_sfnt_off00012509.bin
1cfa9c4ee5a70011fcbba6f727c4dd7c8d43bdeede64f4109fcd43071c570da6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12509 1724 bytes
font_03_sfnt_off00012d29.bin
e8ec7b8eaf32ced9016c9707acc51df41801c86753453304d873d44a4ba035a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D29 24640 bytes
font_04_sfnt_off000164b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x164B2 16792 bytes

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