Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a9ff19cf0548c7…

MALICIOUS

PDF

76.2 KB Created: 2021-09-04 09:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8760059d01fbdb440a30f0500e4944a2 SHA-1: 81c61aa57b63bf3e9f0e5f17f628965d1d4d8e91 SHA-256: 52a9ff19cf0548c7f82b43baf48e8f4341f03211380a94065d23a4c51d18e5a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and embedded links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/c4fdd4351e26cd35dd3eac12a1c93824/xigadutenupotovifagizu.pdf In PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/82945008400.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/8a029ec31b243cedf1d8b832084bdf0c/mufetupoximepub.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/11050a945af65bd6e514a2381bc19669/18625726593.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1ad2873d1---52040988971.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e629b5752---38892610904.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/gemodeduzex.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210429112539196.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/d1ec7260bc3a6ecedfcf2c709637d2f7/rafetegarineze.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a25551cfb1db2de0d8a407c1a59f05c9/91419712823.pdfIn PDF document text
    • https://unosms.us/userfiles/file/5793407412.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/vutufuwojawijap.pdfIn PDF document text
    • http://sdds.be/userfiles/file/28645732408.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/74472914545.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/7e7e2ca7aceadcf616b79364e8b77ec7/lezikigemuxugabamufo.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/8005035572.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/gamarana.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/segikaleruna.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/sevibuj.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/34079602577.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/lelebidezuxi.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/bagolebubijexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=have+got+exercises+pdf+4+primariaPDF 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_off0000c437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4E 11048 bytes
SHA-256: 69d341a0cf6ded90b5a240cf97676bd270995ab98de2c078b81585f0925484eb
font_02_sfnt_off0000f5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E8 17648 bytes
SHA-256: 5d3383ae212ad19ac0dcae4a599cdb5a4944b42e2e722c9b650f0388e3251267

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