Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d590c6dffd48e0…

MALICIOUS

PDF

91.1 KB Created: 2021-09-04 06:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc12daa75a2fae86a53a882b8d262925 SHA-1: ef9f795bd95c354235aeeb1fa46423f99d7b9361 SHA-256: 19d590c6dffd48e09e8612ce7d62a4dc798d0c285d6e23eb89df2906632cc942
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm, with numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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 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://saga.diamonds/uploads/ckfinder/files/zedadidubozizakanazumo.pdf In PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/10463521542.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/3a8959d9fb0a2290773b2908a364f7b4/voxuzukolapamowaf.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fd7bb30373---28963334662.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///52833463981.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/gojk9h5appquiel7e0qbb0l56i/30921781946.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/svu7m7vj7dmk707vs9kib586rp/89901464810.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/05dbecf803b84e6a62df111a9bab27fb/dalekimifamavagunig.pdfIn PDF document text
    • http://insureatkk.com/ckfinder/userfiles/files/xibojipebemotivadusokusen.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/es5qq6o4hno2jtjv3hsh37317m/vanuvubufima.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/f6257f492730a44b03bac1898e791106/59992269530.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/fowalefunexulalebit.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/siropugitamijuwowowajot.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/lumasarutuvoximefa.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/bosikujuvez.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/a7123056d20926aeb265b310774e9432/gepexasovijalawafu.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/14238143646.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c1d0bcd024e15654f0dc3a89978dac23/14453704020.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/ledan.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160772c2edd6ce---76908446709.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3d63c5a81---meror.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/zanajitagavovo.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/492d928d692be0eb04e4433adba000f3/3103607268.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2bd911eeb---xariroferazinav.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4440c9a4e---bovaxorikomap.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/28056937520.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/66756860006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=canon+speedlite+320ex+manual+pdfPDF 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_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 19496 bytes
SHA-256: e291f663e7086f2cfbe335e20468dfbbc42b16b20f486a404abe5295b1ee701c
font_01_sfnt_off00012bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C2 11208 bytes
SHA-256: 2be4146169b61cf9804f468964671b44c6a85406bee7a2863949186a7138d192

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