Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b84c45c273a5b8…

MALICIOUS

PDF

80.8 KB Created: 2021-08-15 20:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c1a33b9fde0a939a04e2c7c50f072131 SHA-1: c23f10bfb55105bed578256ba0f82fcb3d530dc8 SHA-256: f5b84c45c273a5b8f5ee92b9e4112e1c7e892f22afa251908cfaa6c8765cf5e4
196 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress sites, a common tactic for hosting malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a method used to bypass gateway scanning. ClamAV detection and ML classification further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/657d83049422097d0397af4ab011d61a/fapagefigariva.pdf In PDF document text
    • http://auto-spec.ca/fck/file/28535773340.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/gutevuzemebidofo.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/51be7a4d2643482929298248530911f4/vuzimafimaxug.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/wugidofijunopizunatadowal.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/ravododegumaz.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/42967725051.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/93919358927.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/34994810206.pdfIn PDF document text
    • http://beiks.info/public/file/mubuvorifenedorubudakero.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a285152c5a5---gevegidefaxopalemirona.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cfea0a68a---60933780641.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/5822616016.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/52543982035.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609176938447d---tujamoxijujutemiwuvi.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d27a0b134ff---13250755604.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/5641104959.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/26348889611.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16085092159c30---paxugafezipi.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/gdl1bhkrg1rpev120ngjvt05ks/napofoxewosibukajeju.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/91445499727.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/7fce5d1d7b0c494c25e7152a4a520024/riviguxafopurawiz.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/38018795232.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/aq8049noc93bpfo588dgcts0vu/21561190397.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/xalapabuk.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/53123900757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=descargar+programa+ingles+sin+barreras+curso+completo+gratisPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 10960 bytes
SHA-256: 984d0111ca1b51db7cba8e07fd418caebe27897de33ba36a2ab2cb233e39d180
font_02_sfnt_off0001045f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045F 18384 bytes
SHA-256: 89267eb2f8fbdd122b98dbfa266f3422aa6036f665cb7a808d3e47249c9281c6

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