Malicious PDF — malware analysis report

Static analysis result for SHA-256 053be93d820b2432…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 17:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c0072690eb0fa97260e69528c55f499d SHA-1: 3a8903197d3cb51f53f3c0225a654564fa56d9d4 SHA-256: 053be93d820b2432506e75ad374fd2154009af9d7681d9eb657cc7850da15329
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cedarvalekansas.com/clients/875954/File/51682351750.pdf In PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/80552289942.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zubelilizezonorag.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/95907900763.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/93622755396.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/955lf4evc41pq5154rff6t4hmr/zapodipasubafudiguga.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/avvo06somn7vv3m41pvnpcr888/volupusifuno.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f05fb95589---38966860274.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e950999ca1---80475414086.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/6071176851.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cffeb3003---fepetexolatozul.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/zaxuxa.pdfIn PDF document text
    • http://raczcsalad.hu/files/vawagizuveluko.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/3ce7k0vvmjugfa0nak8jai0fr0/22139057597.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/xodetupizevo.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3216dc6d5---94570422156.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/11362018923.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/88079431734.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/2115a5eb5da7bbd83954892c5c6b8e02/dakamirixu.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-27/20210627073126906985.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/eebac46ecc12c02c82f0b674a56c34a5/bulixosudoto.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/lusobogiposunegeluge.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/kakaret.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/231533469610.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/tigezimodizago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=roland+mc+101+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_off0000d662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD662 10508 bytes
SHA-256: 75ae4e690c22933486a6760195b70a7d6ada8e2b5bfb528c339845bad52e34cb
font_01_sfnt_off0000ee43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 18004 bytes
SHA-256: 5956d8b6b515c445f6258473fcffb7997d5ee743fbc629c8e7c4296a71264eed
font_02_sfnt_off00011d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1