Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7dd8a72cdf1d6d5…

MALICIOUS

PDF

72.4 KB Created: 2021-09-06 14:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0a893707dbe37dbb5c5bc52b2cb06a96 SHA-1: ac456481df174c4ce0cf7da13f41674955e427e2 SHA-256: b7dd8a72cdf1d6d5502b1a1ccd2edb869065d54afc8c83c59b6fdd674ca41921
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm with numerous external URIs pointing to various domains, many of which are hosted on disposable or compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=fujitsu+lifebook+a+series+user+manual PDF link annotation
    • http://www.ctnphrae.com/ckfinder/userfiles/files/naxavulawufejabet.pdfIn PDF document text
    • http://www.bandungmesin.com/file/jefonukozadomilubo.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099a4f56bebb---35692545904.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/80672221907.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8db43d5d4---56184348969.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lmnp6fb2d3bs85pms9bl7rb1o1/zusudemabexigodigisineja.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/6771c3523208dab5b153eabcd20b51b2/lewededewuzipivamu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077850f5c80d---gakup.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/bec53887d3703d9eba9ca96f408746ee/6225616732.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea20b499d3---44156851399.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/35412d8f6e5f6871e0c8b11e9da38c7e/96186657263.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/33886440435.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/7277136977.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/2ad97fcf060e5ef1c2d8ba803449847e/45096359982.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/wosefegorojeputavesim.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/gb48iq9ot2aasmlfvij2gcnel9/dejiwasodeluja.pdfIn PDF document text
    • http://primaneighbors.com/userimages/finonifuxamixilubupuwalir.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/nagonamif.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085c2e139ca9---ruxoniruxuzi.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/muxatupoluv.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090aaebbd67a---xagozet.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/76586127260.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1640f1634665d9a8cfd29330f27c2de1/gosugegisetomuperal.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/39514832855.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC82 10816 bytes
SHA-256: 2ea2e6f72828476d78dc08a2fc8d89ae38507848df6be725a57a7d1fb7f568fc
font_01_sfnt_off0000d564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 15028 bytes
SHA-256: 6dfd231b3a43397b68686d41d1d6a306d5acebdaf6b0d3385396eb712c0202a8

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