Malicious PDF — malware analysis report

Static analysis result for SHA-256 40dba4e96b173342…

MALICIOUS

PDF

91.4 KB Created: 2021-08-05 12:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d0b31835ba469601cf1178fb16a52672 SHA-1: 9d0ffc319beaf58ef7f2cbd9b16a45afa34dd731 SHA-256: 40dba4e96b173342e1bc3f184319eb650d29ef8dc90ed31a1ff3d7780cc39a73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://huntic.ru/uplcv?utm_term=poemas+escolhidos+greg%C3%B3rio+de+matos+pdf+download PDF link annotation
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/29tp5ue83msbu4osu15hrbij47/kigolunewiripavif.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/41569714957.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de2e20b709---21265874691.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a723a669199---39063887243.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756c979226a---97285295370.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/58319176101.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/62521246353.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4e2fdc6e1---rirufupulibo.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/10ppf257jgi6mf3mqcvt86fm2r/fibotedixib.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/c10c8045662fb40d4e3304051589a594/56578057466.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/0c10828120139ccf01a29ad250ff27e9/nonogefulut.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/18081099275.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/17391990073.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/b1b73971c72cdb6bcb3c03337aef77e2/14776751539.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/nogosabarebedenat.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd76809761---57449433804.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c75ac9dcb---fararetopusaras.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/gpk2pr6h560vnauouho15qj242/zifizezudirivumoregunadej.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/sulowoxepenetujojetisiz.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/winejolinomosuvo.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/nowawozuganaririwe.pdfIn PDF document text
    • http://cga82.com/admin/File/24675838600.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/18031589448.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A2 18864 bytes
SHA-256: b6ba896bdbb05a49883f800d63d334d3e0faa526f7df6714c57939666338812c
font_02_sfnt_off000137dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DD 11292 bytes
SHA-256: afc3acb36fce992ef6180162b6e4d32e48229f38aaefdd3ec1102113c8155e11
font_03_sfnt_off000151c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C6 2372 bytes
SHA-256: 44b0f52db7314115127d8c98708714d01602f65d7ec6abbeb281e5013f1f28c8

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