Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f27b74ec7bb6b6…

MALICIOUS

PDF

72.4 KB Created: 2021-09-12 09:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 656537af08290f0b560ee50118b69109 SHA-1: f3903d52fe6cb4b7fc7b8053af8d82b3935cbc9d SHA-256: 12f27b74ec7bb6b6b2182bd639406ee339d1f7d5fb675dc4528fb3d52bdd17b6
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 disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=best+wifi+analyzer+android+app PDF link annotation
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/58869756635.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/ririrokoxolebadunavifuxi.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303a5d9fda4---mubitonoxag.pdfIn PDF document text
    • http://live-net.it/file/rewusowagu.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/90716542109.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/7801603535.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/18147218588.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/59639026683.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/90972336512.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/12477721434.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/34638649388.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613631d92869d---59877272457.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/repabumebeleruvesifutivu.pdfIn PDF document text
    • http://beijingteye.com/upload/files/89078520254.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///risufituseforusogasomu.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/38306728697.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/8303409532.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341e9ccd07a---mowobixazodaze.pdfIn PDF document text
    • http://tayles.com/uploaded/pojeged.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7f34a78ab---79819183934.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9f4dfabb5ccec3f79d46575aa6158198/19863627844.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/3391358011.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/13351071391.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_off0000b9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C1 16104 bytes
SHA-256: 11ef08f0ba551909bde955b09beb0a70cc99e6cc839947a567a4325eaa878bc0
font_01_sfnt_off0000e26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 10804 bytes
SHA-256: 81e368e3b6d3967191ba81ac06bab97f79442d47f8eb0c4c904798c11170084a