Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d1168c9f2dd2fc…

MALICIOUS

PDF

78.9 KB Created: 2021-09-22 17:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 645860fabcdd9ebe3902542a31a8f893 SHA-1: fe2ce8bc0ed755a2dc43c960ba0179f951a15e66 SHA-256: 34d1168c9f2dd2fcedbabb89e416a1b6ad9dcf336b3008dea67f3e42ae949511
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and a link farm heuristic suggests the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/duvos.pdf In PDF document text
    • https://yellowstonewildlife.com/nezoro.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/47297668488.pdfIn PDF document text
    • http://zenithmetals.com/files/fekozobipojolonoledi.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/tujuwesixopiwikijaxola.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/famokix.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/d0cbcfb9e1cf37544d786e06933b96d2/70089238963.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/suvezodezugedol.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/76432321396.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa6c4dbc16---majalofebisexuximixeru.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb39a158a---vumagemapemibunimokev.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1b9382a15a2828ccb943be78768adee5/40519533417.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/jojojapurovalexadopifab.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/zixuroti.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210920_2BC07548ECE40A78.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/bepumupipofupe.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/2732617342.pdfIn PDF document text
    • http://one9five.com/userfiles/files/gosowebubasap.pdfIn PDF document text
    • http://air-con.ru/upload/files/vidamo.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/82828424219.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/74380268341.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/88751298097.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/poletagezezivoworopofufa.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/2144888413612f7eb820e92.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+garry%27s+mod+mobile+apkPDF 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_off0000cad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD4 11104 bytes
SHA-256: eee5234fe246e4bf61dbcf17261300458754593bad74661f5445e2f0845e27f2
font_01_sfnt_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 18824 bytes
SHA-256: 173b807a4610076a941af063574df8e48e89d453c13a9611f359a467ad52270e

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