Malicious PDF — malware analysis report

Static analysis result for SHA-256 263026c24323dad6…

MALICIOUS

PDF

82.7 KB Created: 2021-06-25 22:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1aac7faea08fb10251014bc882af355d SHA-1: e75c8dbbf90125bbf3e15abc557c787d007fc87e SHA-256: 263026c24323dad69e0e032d5999677fb482acdb26e42d7b31b61718ba4e5877
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 WordPress upload directories, indicating a link farm designed to redirect users to malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification scored it highly for maliciousness. The presence of external URIs and link farms suggests an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/a84f29888af6a010a544f8824e2d0f1f/xafugaxokofis.pdf
    • http://fusen-es.info/yamituki-n/uploads/files/fupegiwekewanu.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4dec62170---sologeguduf.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16080256b593cf---tupasurojeg.pdf
    • http://locthanhwindow.com/img_duhoc/files/45399537762.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/61a3d2e6e50a572fc6149a8305f3265b/nomalozulop.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/02c619b947fb62969043142e3b46a4b9/41752092157.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/b5dfca7a2bcf998c6a1992b915016c1d/tutalapasovevewu.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/nejhu49ktpv9ar85rum8np1q55/71523724183.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919e80dcd1a---buvuretoxemabenimulonu.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608446467da5b---sujotaxegilavejobepegif.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/d12f9447841daca7dbd255b105fecf25/zezozalunigevijorisojiki.pdf
    • http://dailymaydemtien.com/userfiles/files/55256245096.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a4d9dc4f4---risugid.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886bc73bb3f---59824723585.pdf
    • https://cicadit.ro/UserFiles/file/zufowokifutinelogadum.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/3dd54cda4af1dd7f85884ca056222f7f/mijuguzatasevileteto.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa3e88163ec425de870832da656988da/95159473706.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b3951cdc4e1334aef7dcc048e642d367/vovuronofarabejofit.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607071a32b84a---26319469647.pdf
    • http://agendaalzheimer.org/files/galeria/files/jabovojunajodaxeda.pdf
    • http://inter-travel.hu/_user/file/liririvonedapasoxodarukom.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f75225680323560dfad2782424a3627c/50416876124.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cabba104325---kenebakesatokigor.pdf
    • https://triptoboloyfoundation.org/editorsfiles/files/74112411336.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/9j9okfes2o81hb84k5dp8fu56o/xigasuzadirisisupefoxudu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+latitude+of+the+equator
    • 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_off0000e2df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DF 16792 bytes
font_01_sfnt_off0000faf1.bin
988b811f211df70efc53a1f885b0cd9bb4f67d8662bf6fe9ba1bedc40a9d4112
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF1 16656 bytes
font_02_sfnt_off00012618.bin
7e748f6c445b9a1c945a8bed1ba6add7674f3f2e4cb6b79f8f0d4e06007691b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12618 10388 bytes