Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ca23a2162caa30…

MALICIOUS

PDF

96.6 KB Created: 2021-09-17 08:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0bf6d387e599faf1b6269cfb4b70ac14 SHA-1: fa660e92681c79eee3e7676fca18c12036d59858 SHA-256: 42ca23a2162caa30f36f9a95db995ea0938a98a51e3ab0cd6593000501ba14b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external sites, many of which appear to be compromised WordPress upload directories or disposable hosting, suggesting an attempt to host or distribute malicious payloads. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=art+line+design PDF link annotation
    • http://re-media.ru/foto/ck/files/53134347592.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/zemizurokegef.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/13339226531.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/vizefin.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613de4cb67bd4---rakogopolujuzelob.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/tewozibupokogugo.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/zafazatumedit.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/74603104424.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e267a28c34---biruronaxa.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/9eruibbij8poh0hr1a86p1q48k/vasifowovonutopak.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/16441205201.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/61672984109.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/nezigokudarageketa.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307308523ae---fugazujobifexepuzelixim.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/65205887183.pdfIn PDF document text
    • http://wawa757.com/uploads/files/nidigogazuferenuxawej.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/jogolobutabigadusom.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/visomiwuxazimusova.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/dogiwuxus.pdfIn PDF document text
    • https://seikai.jp/free_images/files/zewulomovukuzu.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/16969778226.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/67179361060.pdfIn PDF document text
    • http://geotersrl.it/file/97694269046.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/ae8ade20c00087c05b15e508939d2a97/murumovikozapisixiru.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/52765035158.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/buposevififixepojiwedobiw.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/wanatogakalupataxo.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_off000116f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F5 18076 bytes
SHA-256: 543ae04b504fee102160f7ef142b4f5660ee8b6fe901f731d8e1d9efb0c37dbe
font_01_sfnt_off0001460f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1460F 10124 bytes
SHA-256: 44e8b0bfbd248e3bd00018585233a0e0d305b116767d49a1be1220a14087fc97
font_02_sfnt_off00015c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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