Malicious PDF — malware analysis report

Static analysis result for SHA-256 0803d23714ff330e…

MALICIOUS

PDF

86.2 KB Created: 2021-09-02 04:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b421c50cb1a771f237c2818e211cce28 SHA-1: e700b97dd49860837e13931d6a72d04c172442e6 SHA-256: 0803d23714ff330e3649780cfce33b32b6580592ae8210ef8243938e9cd78d74
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a link farm pointing to various PDF files hosted on potentially compromised or disposable domains. The presence of ClamAV detection and ML flagging strongly indicates malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sjzhtchem.com/upload/files/77977350482.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160895cd33ab78---75350046006.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/jedudemanelufunukekivev.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/bibuvalobozosalam.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/97cf593a7508db690579ae9aa9c18b6e/fomugetojem.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/c9aa4db6ea767b1b398e327cf8a06a9b/29905207526.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/nukowebowetiziwunugoluke.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609a99a8c1615---mojasikonawavudaxudopun.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/07d297896843a967326047f2a99da88a/remusi.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/74141173230.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/52673131310.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/52425353547.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/lirukafuf.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a09da75d3e5---xabimudugapowenaxuliwa.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b09df33ec---suzoxezawajate.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/binegelir.pdfIn PDF document text
    • http://metapolar.hu/tmp/jazijonopowimujonimujid.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/wudax.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/vexel.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f80f76d0ec---56300650065.pdfIn PDF document text
    • http://sushi-belovo.ru/files/32231604496.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/zakebidepojutu.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/34233754036.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/60c46c6b97f628cd83b367d334231a1b/56903023878.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160affbce607d5---18940340405.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/fubomopodogekegujepatav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pdf+split+and+merge+softwarePDF 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_off0000e2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A7 10928 bytes
SHA-256: 5185a778db2400ce468d8c5a4d855a4c3f3d82ee29fddb3df8099d88621c088e
font_01_sfnt_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DE 20680 bytes
SHA-256: bce4a27963bb89073bdcf2de885892082ba10a33610052fdbba1331e0ca8652a