Malicious PDF — malware analysis report

Static analysis result for SHA-256 2589a2a0252a2ebf…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 15:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 140065fc38a986fe839ba90137240dbd SHA-1: 82eb90f5f732f2679be62370a46574943702fb89 SHA-256: 2589a2a0252a2ebff7d2ab19740a22c021c2ed4e47818f0ceb784757b523f892
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, detecting it as Pdf.Phishing.Trojan. Heuristic analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised websites hosting other PDFs. These links are likely intended to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.mecateengenharia.com.br/ckfinder/userfiles/files/jifuvedenekulufu.pdf In PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecfa3496ee---dulebagazejegudetiju.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/91337589953.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613930133a94b---81012306351.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/pogeruwebulozoz.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16131d69607c13---keleb.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161390dd58e03f---72067501225.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee1f7bc05f---silutenap.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/73391539262.pdfIn PDF document text
    • http://www.grifin.sk/files/veterisanowot.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/datijapodixor.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210901130845.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161315ca71d242---pilekuboz.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/ruwowedokemegidufawo.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/23076944169.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/22979748057.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7edbb019---66793446327.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/murebaxuxuga.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/fafuxewopavunojomuwaruno.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/ziwotafomibofan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pdf+reader+android+4PDF 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_off0000d8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A4 10116 bytes
SHA-256: ec9e0da1229446c2d75297b07e6772ae490ca5b5b391bfa977ecb6b4d1de2f63
font_01_sfnt_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 17256 bytes
SHA-256: 1494c29cdc64a8cc1e5852eb81a330144f257580bb8d0489d87788d7658d9ee2
font_02_sfnt_off00011c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1