Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d27f7a0c6db126e…

MALICIOUS

PDF

79.3 KB Created: 2021-08-18 22:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 36c22e845c1d7f6234d358594c43b9d1 SHA-1: 2e922cd84f377c3790b3d448738caba298f812b7 SHA-256: 1d27f7a0c6db126e3a65f9e705c2c5ae6569aab5db42da41151b09300543ead7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content, likely as a first stage in a phishing or malware delivery chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chnli.tw/CKEdit/upload/files/savibomugudejoxepuzog.pdf In PDF document text
    • http://vikingpaint.com/user_file/file/taxadatanovimujo.pdfIn PDF document text
    • https://bdcomunicazione.it/file/jexonalajosasozezukerus.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/50009077028.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/10023808107.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607269cc0798c---26849418977.pdfIn PDF document text
    • http://fastgood4cheap.com/clients/4890/File/jokepunixaxofoloxodufig.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/bewumu.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/j0hp3hgolsp7cqet9pv9pjo9bh/devifajozakidawamiwer.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/73081392669.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/51406775575.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4abf28112ffc938858d585a076aba436/46103903864.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/23409977816.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/zubexigokokizejadibubikiv.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/bavarujujibi.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/kelevonifotojomaxijuj.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bda84daad05---kojuru.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160986a0786d4b---bisodogasipafesugamug.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/jukedafaxuviviwadafunub.pdfIn PDF document text
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/pfuferhphhbftsk2ksq7qjq8s3/3118486340.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/73873758986.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/44157557318.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160840bcef3e3e---23575866990.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7239197da---bawijesuwosopijare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=possessive+nouns+exercises+for+class+6PDF 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_off0000d2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB08 10668 bytes
SHA-256: 3499662c473bb4dda6b42079ec6d5d3ab86aeda5e1ab46a5243f101a53599764
font_02_sfnt_off000103ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AE 16932 bytes
SHA-256: 9a1c348ecdf685a1a3163027e3e3c39225a0bde0bfe051dbd18138a1dd5340a8

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