Malicious PDF — malware analysis report

Static analysis result for SHA-256 532fcf428e996b4a…

MALICIOUS

PDF

68.7 KB Created: 2021-09-02 05:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 664b0bf029758ec8606d53a19d64bca5 SHA-1: 2917e9e70b626c193a20670e866411cf13677153 SHA-256: 532fcf428e996b4ae78335fbe2161309275a9a60dd2cef24e48f384de9adb7e8
176 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document designed to trick users into clicking embedded links, which point to various compromised CMS uploads and disposable hosting sites. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate the execution of malicious actions via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://hitelesen.com/userfiles/file/43106769327.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/19448792266.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/3bac1de941066863c130b3be6d49a1d1/gumuxosofeguta.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/tegetebu.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/e3aa4982723c1333ba3c99b4097915ff/wevux.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/zaxasewedipase.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/2487939115.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/vapinuxuginetatuwolofebi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130058a8176c---xixonok.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c686b779dd---vosofuwunimaboto.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/vonapuvemuvuwemifu.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/puvetirawejorowez.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/dakelajosile.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f37daa3f9cab0d6b3792d16a875a1f31/kiwuxikiwub.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/8a1a1c168d12336d2c48f45d602da12b/26950693768.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/ddb9ca6ed52c07fe50f89f40420fb0cd/54167429284.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/96706694239.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/85972898147.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/25390085879.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/fubonibek.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/pufikerudukowin.pdfIn PDF document text
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/21322923306.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a46cab55989---kezaruriv.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160707e8419ba1---sunimomasopedofirefula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=archangel+of+knowledgePDF 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_off0000b28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28D 13612 bytes
SHA-256: c0f988d02c817ea7c11c8396f50465ac4970c4fbf981c41f35ffeb6214ee03ef
font_01_sfnt_off0000d404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1B 10556 bytes
SHA-256: 476068c1a91bc81d6d2f132251ada015bf4f18e4e00c5a400c7b3b060328f0d9

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