Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4952faf18a44f25…

MALICIOUS

PDF

83.0 KB Created: 2021-09-10 19:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e4b20e8733d4b8ff6a4f9204dc74e39e SHA-1: 184a2c1f524e1a3d584f3f977bed59a16e4a055b SHA-256: f4952faf18a44f25e8c27db2a390f6f65df5208e78b80764c608458ea43bf1e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or are part of a link farm. These links likely serve to redirect users to download malicious files, disguised as resumes or other documents, as indicated by the 'utm_term' parameter in one of the URLs. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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 https://allytemp.ru/uplcv?utm_term=resume+sending+format+in+mail PDF link annotation
    • http://rovitek.com/userfiles/file/gufitivudawupifo.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/vatufawerabi.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/tujaxolawef.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/sezuwaz.pdfIn PDF document text
    • https://priscar.com/documents/files/17416565912.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613853eab0244---49026349225.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/mesuba.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/23985003704.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/30943924889.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5b39ee99---94859490013.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/9010a069d3c0aa7451ca4cb68b908ae3/zuxurulexox.pdfIn PDF document text
    • http://klinok-saintp.ru/files/jolugorulikisova.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109012221435665.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/8829601138.pdfIn PDF document text
    • http://aven.su/userfiles/file/vatofudiw.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/87585412322.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/35743118843.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/32778383563.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/45623100633.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/3069000812.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b56f3a617---61060433792.pdfIn PDF document text
    • http://mqskin.com/luutru/files/74569346832.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/rezumelu.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_off0000dbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D9 10840 bytes
SHA-256: 1e70d5bce4ea8d3263d2952945571425f110238e7e4d0b46b3768a2145734d8f
font_02_sfnt_off00010c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9E 19096 bytes
SHA-256: e2f89c615b65327f28d55d9e8dcc469352c6a6c150bee0aa6f4e1b6b4037116e

Open this report in the interactive analyzer, or submit your own file for analysis.