Malicious PDF — malware analysis report

Static analysis result for SHA-256 4767cfb84c2a698c…

MALICIOUS

PDF

83.3 KB Created: 2021-06-14 23:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d94038ac5b56f7f256837c89460e94b3 SHA-1: c0bb64983c32ea7ffec712150c7a34db1c8e7a23 SHA-256: 4767cfb84c2a698cef1b619d574ccd571d22678eff1862ed4afa49a7d13bff08
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution attempt. It contains a link farm pointing to numerous disposable domains, many of which are hosted on compromised WordPress sites, suggesting an effort to obscure the true origin of the malicious content. The presence of a URL with 'happn+premium+apk+cracked+download' in the utm_term parameter strongly indicates a lure for users seeking cracked software, a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://krisoc.ru/uplcv?utm_term=happn+premium+apk+cracked+download PDF link annotation
    • http://studioriggio.it/userfiles/files/dumivibogujarog.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/aca2b516f8a603de224d52501dc5892a/vamidixalefeme.pdfIn PDF document text
    • http://nb111.store/web/images/ckfinder/files/20210610194540.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/gusopugowifaruvene.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/a33254b3777e3fc801a5273a578db7e8/kulizosolemuwezaxatuwi.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607902645d072---gogawofufifi.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aa1ecdfa2---12440436912.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b4ecd888c---22142260585.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072c8cd9eaf7---27426323518.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5d0066da9---fivegiruwinaj.pdfIn PDF document text
    • https://chp-travel.ir/data/file/wukimowafibasik.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1838c1d586---lurererogajumolokilanego.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807d1dd91ba---65670927339.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a660c27407a594647fc47c52292a31be/jozosa.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/gmocvennlaks3qedogmumnbbdb/63045208089.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 5156 bytes
SHA-256: 5a5b66f348f698d5a7e93d293c7d1f201241200fba9f62dff9b7f595b134d825
font_01_sfnt_off0000fad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 1964 bytes
SHA-256: 409ee9a3885541ffdc58d6bd2d6bfd260a46de59e4270c8c7780dd2af6cdbafe
font_02_sfnt_off00010431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10431 11248 bytes
SHA-256: 14e7ee6048b15e72e09b47a418730a5c74653c0074f74d1464c7f79647615d4e
font_03_sfnt_off00012ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC2 16080 bytes
SHA-256: b9f164109fa9d122eb450efe3338d31fd540c63501df6ab23cb6a1b40ff3b1a4

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