Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4420bf5d0d57a39…

MALICIOUS

PDF

77.1 KB Created: 2021-09-27 02:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a4d6200b6d2713f5594ab89af5f67b5 SHA-1: ce978dce40ff7996beaef8805ac4a6f286a7a18a SHA-256: b4420bf5d0d57a391c67e3eeafab0b9a902b1be7bc43fb6411dcfcbc5a29f51f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript, along with ClamAV detection as 'Pdf.Phishing.Trojan', strongly indicates malicious intent. The document likely serves as a lure to direct users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crysiq.ru/uplcv?utm_term=can+an+instagram+user+see+who+viewed+their+profile PDF link annotation
    • http://gynekolog-zilina.sk/uploads/fck/file/fuzonozumotusezagixagi.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/36859110442.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/wozagivifulu.pdfIn PDF document text
    • http://portableandcool.com/files/files/38878063843.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/pasulelalili.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/totetuzilipubifuwav.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/7882799313.pdfIn PDF document text
    • http://ihdbd.org/upload/files/71215693975.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/fekudasadotumut.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8a8ca8f4c293b780876ec1b3fa21fd09/gizipedajudageviwofileje.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/75538724156.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///papirupujesixebewewo.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161502cab2e4dd---20626922431.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/897d947a4791ea322ee9e1f0ac2605eb/legijulanaxulewisov.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/76782622551.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/zinifu.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/45495439923.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/72271363945.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091811500993.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/10/99650191390.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/66455937231.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/8689b28fc9b17d8bca4b5f1b03ff29dc/24791628508.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_off0000c674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC674 18168 bytes
SHA-256: 3eedabdb97dce8790d27385fc6f67353ca0f66e552220cfd5bdbd402a975912f
font_01_sfnt_off0000f478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 11228 bytes
SHA-256: 4fa8a27c18ee1314408602b96b691843c2ea94e29c7ebc62f8c5ca719cf34d54

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