Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8bae72d3073b1a…

MALICIOUS

PDF

76.5 KB Created: 2021-09-19 01:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 16c41faa8e0928a4f43a80a726e60e4c SHA-1: 5e72cb332845654cb58d4fef3ec5f9d2ce0cd0cb SHA-256: cd8bae72d3073b1a8f23d9ca55af417e7d1739c264f4af087a57e34ecc50a555
256 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains multiple heuristics indicating it's a link farm pointing to compromised websites, likely for phishing or malware distribution. The critical heuristic 'SE_SECRET_RECOVERY_LURE' strongly suggests the document's intent is to trick users into revealing sensitive recovery secrets or passwords.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://philabc.ru/uplcv?utm_term=linux+remove+password+from+pdf PDF link annotation
    • http://misterholidaysanprisco.it/userfiles/files/xexetan.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/9922867d6a5579645e2c42a1ea72ac73/valipakolugalurewewo.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/77355110513.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/85914542587.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/65809339034.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/23729573310.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/4864541771.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/rulezubevopasurev.pdfIn PDF document text
    • http://hainfelderteich.at/57668867893.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/29360155253.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/kasipezefib.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/lqdtqfke292nf8vnk72f9c1od0/90096427221.pdfIn PDF document text
    • https://parkettworld.com/upload/files/3106858366.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/81276135452.pdfIn PDF document text
    • http://hidropro.hu/upload/15577121137.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/pizaloxipu.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/68287583247.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c5ee4d775---53605674794.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/moravasilowakawapivisoxu.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/luxit.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/nunidep.pdfIn PDF document text
    • http://e-sheremet.com/img/sewevojivixiwijipuvomif.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/67038848913.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/68656990471.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_off0000c136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC136 10828 bytes
SHA-256: fd712950fd0c22171e78bc4f78acf17ab3d5ac91dd0150191e5317ec97caacd2
font_01_sfnt_off0000da39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA39 19284 bytes
SHA-256: 25127142c4534666f54342e5984dbfaaff214cc5e81d71eafc5fde282fa39ee2
font_02_sfnt_off00010c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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