Malicious PDF — malware analysis report

Static analysis result for SHA-256 658b52239066d2ff…

MALICIOUS

PDF

91.4 KB Created: 2021-08-16 01:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 92aa96c5fce3e0cdd24ccdc84bfd7492 SHA-1: f80fd226199c8300a0adb62781c12c7e177f6f39 SHA-256: 658b52239066d2ff3adaf695cb195441ee2d28f23241fbd0b2917c25a6f9d908
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it functions as a redirection mechanism, potentially leveraging embedded JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9777

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=wwe+2k17+caw+formulas+ps4 PDF link annotation
    • https://samavetpharm.com/userfiles/files/sowejudakuwo.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/76808571705.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/mafakuv.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/girafamuxewel.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/sireligipetoxu.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/eb8c5cebc89a7f004314280ce8138810/wigumezoxoranebavif.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4f2cb3602---35903159874.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa77c08a875---jonoruzeloda.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/58256391533.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/c2918e9a4e9cc2bb39c43a34c5ffde98/fanexarivofumox.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160870d3e741b5---75625094389.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/27787042681.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210707171625.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/49897954218.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/xuwivegasodovisive.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/xukabago.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/33476570440.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/51413209122.pdfIn PDF document text
    • http://mylodge-naoshima.com/webulapelikikeki.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d750c067f2---doxoz.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/a66a13ab2098ec8b2b150df8bb340219/fupigamebenakefov.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ff3a1998639---famogineromapuvobatanagi.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e85f5b1a96d---vugazi.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/45328768352.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/ponogatozazozigodibebete.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abe6441748c---58142368065.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161190a0bf3481---riniberujonokunerugu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 19164 bytes
SHA-256: c7a95e3b8a6f9bead5242fef69be3a3c5a753c93b7c13e2eb70aaf66aead2817
font_01_sfnt_off000117e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E4 10920 bytes
SHA-256: 54e4f2dc52679d8658daae12984ac9820c385bcc5ddeeb4a4a11fb674f64e181
font_02_sfnt_off00013182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13182 16224 bytes
SHA-256: 749d0e0a2ebbce6e3a842727ccefc785b5fde86fcdd6c62922dcb2c91ea58cfb
font_03_sfnt_off0001474b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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