Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1aa7fd3e029c86…

MALICIOUS

PDF

96.3 KB Created: 2021-07-13 16:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c7e1db012a34c33d73ce530db7162380 SHA-1: e9052473286b910cc5b1d44d89167ced776b82f3 SHA-256: 8f1aa7fd3e029c86397e90e12c1c53fd035c2664b9e9ec7bb0a9a3136aa84aa6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malware distribution lure, evidenced by numerous links pointing to external resources. Several heuristics indicate these links are part of a link farm, with many hosted on compromised or disposable domains, suggesting an attempt to obscure the ultimate destination or evade detection. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving the delivery of a secondary payload or redirection to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/64616667695.pdf In PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/raniwovufoxirinox.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///dafato.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/88531213494.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/s8bpbomi8e00vooo90pjrabis4/saxudinebaxulod.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3a1b9a15a---23706051059.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/torosusizudusu.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfdeee759f---19185760753.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/baxobovop.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/jokerefaka.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c696a4733e8---79028401717.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/76077429510.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/b75a84c627ce603d594407a1b73cd4d2/75110015418.pdfIn PDF document text
    • https://dm288.com/slicice/file/nidetojenijotila.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/3492806263ad2fec2703e40078d76408/54968030924.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/61617699604.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/202b948f72c554f17d0a319f841b53bc/tobelabukofusu.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/beveriw.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/wolelegawisafixelaxevotim.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ece0b1e5ncqsof9jmirfotaao2/54668047486.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9fa633cf7---12719426416.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/22f861be89eb189d1811a380e1ada93d/dujekilizova.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/lipagegudijutu.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/finazabe.pdfIn PDF document text
    • http://medrea.ru/upload/files/fewebukimipo.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/45461282313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=world+geography+today+online+textbookPDF 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_off000116ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FF 16840 bytes
SHA-256: 603ab030f15cefa981dabf4d5ecd603e18a2abda9b3b1217c9d036fefaa20c2a
font_01_sfnt_off000142ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC4 10944 bytes
SHA-256: ddc5c160e36f82fa9bed65033b17fa72811b5ee493fb1509b8105f9061116ecf

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