Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f967506a64195e7…

MALICIOUS

PDF

70.2 KB Created: 2021-09-30 23:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 66c9d68b2af49fc0f511c431211fc4cd SHA-1: 65576dc35923629b8579cc320c6dc1479abc4517 SHA-256: 9f967506a64195e7a1f78931ad1e379de47cc74fdadafcc04f3a140bca551876
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to numerous disposable domains and compromised CMS uploads, suggesting an attempt to distribute malware or phish users. The presence of external URIs and the nature of the heuristics strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://crewmak.ru/uplcv?utm_term=a+quiet+place+online+free+movie PDF link annotation
    • http://emblem4home.com/UserFiles/Member/File/36675755492.pdfIn PDF document text
    • http://mayersoffice.com/userfiles/file/10112715031.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2730115ab---66295539764.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/toxagugotezojevenotafipif.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/lenem.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/jemixukiwudiri.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/senajev.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/fitijunuzujekedapewe.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e1338e49a97d589ca81f1da98bff6cb4/84206787721.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/1303086250.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16155edf1a4e3d---7733508084.pdfIn PDF document text
    • http://bakoca.hu/files/file/texiwavevifaxalenonusoduz.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/76385735670.pdfIn PDF document text
    • https://anesaportugal.org/upload/file/dubazefufuwefijufiw.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/lovogiwutij.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/82691265211.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210914122153.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f893cbf66d---96475206985.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/ziwafuxaborovi.pdfIn PDF document text
    • https://ibericadearmerias.com/file/89652351288.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/nisusuxub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fb76d2759---zedebajilotes.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/c3516d426ca5d44b5bc7d65b98ff0070/lusukegofit.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3907fc0ff2dd45843e8bdbf68ed98be9/mabilaxikajenoguj.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_off0000b3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFB 15108 bytes
SHA-256: 7f58d6a17c9fabe5dea9a5970456c6f440529f1842a3b20b7f3d3adb3cc673e0
font_02_sfnt_off0000f22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 10768 bytes
SHA-256: c3f4a10a050de49271dca36bfcd928ad3d64fbc183f88acd87a56f82fd0847d1

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