Malicious PDF — malware analysis report

Static analysis result for SHA-256 e301e054ca869008…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 11:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2bf7cd0dedcb7b880c87aec529ec5edf SHA-1: 98f2683f5729f503390fbc9d18ac43d35b6dd5e5 SHA-256: e301e054ca8690082ebc58b50fce7c5daccdf24616e09207aae185e654659a8e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cructi.ru/uplcv?utm_term=vpn+monster+vip+mod+apk PDF link annotation
    • http://youngthisyear.com/ckfinder/userfiles/files/kiloxizililigogefove.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/50740427747.pdfIn PDF document text
    • http://jarosi.hu/files/file/pifoxezepawewojaxujapewum.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/61219743990.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/kawewavu.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109091032018369.pdfIn PDF document text
    • https://digireg.at/upload/96525218963.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/60108644052.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/57861935991.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/xuwupijowajojaxoduvo.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/27566597886.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133244d2508a---lefixoxulugagav.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/tozixepebejetudane.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135d6c0d89cf---nobolodibovagixator.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/gonizozuzuseloz.pdfIn PDF document text
    • http://knipia.com/userfiles/file/mifozefalo.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc8c2bef1---63167156525.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/gafusogosogeratirefu.pdfIn PDF document text
    • http://renknh.com/ckupload/files/28400493749.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/tujagoted.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/wovolenoxowenafulaminu.pdfIn PDF document text
    • http://nanopena.cz/upload/file/63946483324.pdfIn PDF document text
    • http://sial.pl/galeria/file/12273802460.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/50312340296.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_off0000d4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 10636 bytes
SHA-256: 1450d9af079d49dd37a7c1946df723d17de23d7205d3bc305cd5ccecb8699f22
font_01_sfnt_off0000ed20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10532 18256 bytes
SHA-256: 45daef8131448b4963007cf287b61b1b22f1bf1fd744ae6ee3995fab2b834424