Malicious PDF — malware analysis report

Static analysis result for SHA-256 43795d827295742d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 10:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 58915b7f6d0ee99275622d668e997992 SHA-1: ad37dc8e7cce636a7c7b17e1fa4d05ed368b8243 SHA-256: 43795d827295742d2268b94787aa2a23566d2d2f8f4a34a962876a41e930f6c0
196 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. Several heuristics indicate this is a link farm designed to obscure the final malicious destination. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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
  • 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://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ikeru6bgrsnh1hdt4j692l0f87/99939437339.pdf In PDF document text
    • http://sztarmedia.hu/_user/file/pepusalibitopidad.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/1bdd10ca25031ec43c6ed4f32a07cc9b/nuferakogosojuzoge.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/m7m63b9l17m8aoefnr35g4mr62/jixokoraro.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/bakizemipisoderajewufa.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/fiset.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/lukuxanugenadenebisi.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8ccf3589f---dimovetaxo.pdfIn PDF document text
    • https://armenia4d.com/contents//files/tabedepelosagune.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e69990f48a---75642739344.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/65597917347.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/gofibamikubawarerowemen.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/9dde6ba159ec84c9587b66f66f6e14d5/vewefep.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3d7f38028---33314464763.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd8bdd387---89800992794.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/jinazapenowivimefab.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e9dcb1d519---56183029972.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/67705339539.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b355ab886---vasivitenag.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/kemepesem.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba3bac96ba---54568754820.pdfIn PDF document text
    • https://medtek.vn/storage/file/gujofaluregebikusaz.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/morepefojijemomezareju.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/6561194188.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb84c05d4b7---tawubi.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/tigunulapun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+moon+reflects+my+heartPDF 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_off0000d722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF34 22412 bytes
SHA-256: 4df339c86ebcc9eb76343c471e6909b98c7b19df753e73d8ef1f06a52480de74
font_02_sfnt_off000129b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B4 10588 bytes
SHA-256: c9c2e8552eaf71b8b34555a58a0c01b065bfe25cfc1f54aeab9362a7639f9762

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