Malicious PDF — malware analysis report

Static analysis result for SHA-256 40669a182ca8f7e7…

MALICIOUS

PDF

88.0 KB Created: 2021-06-29 04:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b88fff7bcf918bafa95819aac37ce679 SHA-1: 8ae905346306fde369102fa6c059276b4334603f SHA-256: 40669a182ca8f7e7fca2e205b1d364afafc626d27a50bc851dae5f68810300e8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

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://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/acfe7aa5f11228d4f73765a032b6d03c/57334880698.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b9beddaff---sijilidulubovow.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ta6teu6s56rtnje3ed48opud37/majipor.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608756d0c2396---kubupedose.pdf
    • http://speaklifeiamgreatness.com/files/files/20281160522.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a411134a5bb---rifiriwumejinef.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd7b8035e---wakemoludufokebolasima.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/e73a3b91e1fda6a1444c9358b3964a09/zorexagobomepepomexo.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/57fd9e6427e6781422c4f2b2cc08437c/voweturilegepiwemozejak.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/794a1834d9e6b36a1ce851a72a3c9402/98318314906.pdf
    • https://cometsecurity.in/admin/userfiles/file/sibipipemuk.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d33e58a751---vawezoxuvujipopokipo.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/j4f9p4u1k5v2v10652g6n1ah90/bawer.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7178a2715d---birazixewasatironiwig.pdf
    • https://urbanlivin.lu/userfiles/files/94376004127.pdf
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/busoxoru.pdf
    • http://irinaburmistrova.ru/files/mavalorazebojog.pdf
    • https://performanshost.com/calisma2/files/uploads/putagofezag.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/fsfhjset8p666t17hiuvr3k8nj/remitev.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e8dd70e7b---ziwowob.pdf
    • http://yourbuilding.ru/userfiles/files/zomiwo.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083862a2367b---dexubimorewija.pdf
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/joxigajavinebezosixidejoj.pdf
    • http://alnoorcity.com/userfiles/file/votakoxexi.pdf
    • http://alituncer.com/userfiles/file/joset.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=we+are+sorry+to+see+you+go+traduction
    • 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_off0000f0fd.bin
d982c7546f6b87fbf20c239572328573974d01f89838fe224f2d0c58b736e01f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FD 19016 bytes
font_01_sfnt_off00012032.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12032 16792 bytes
font_02_sfnt_off00013849.bin
3d014f13a29126097fa8378b4a56ed673f248a3cf54b7225f607bc23adc1d94f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13849 10708 bytes