Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4887e59c77b4cf9…

MALICIOUS

PDF

71.7 KB Created: 2021-09-08 11:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4f44063c1dc05a8bfb63ad54cbf38e56 SHA-1: b6016611593c7660f5ecafea32cb26cecde205e4 SHA-256: b4887e59c77b4cf9ece0ff5ed3de5fcc4dde3fecc8f15db285334af4971b1613
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. One notable URL, https://coretry.ru/uplcv?utm_term=peaceful+pill+handbook+pdf+download+free, suggests a lure for downloading potentially unwanted or malicious content. The presence of these links indicates an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://coretry.ru/uplcv?utm_term=peaceful+pill+handbook+pdf+download+free PDF link annotation
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/pajonimegumewewape.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d94ee3a9eb---7843640895.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16114abc69cab7---mipekanisuremop.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/sitemikokipukugonereda.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/18081332287.pdfIn PDF document text
    • https://digireg.si/upload/zederolelapinak.pdfIn PDF document text
    • http://ud2-140.com/files/40674018735.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d6fc596095912c6c25fa4b561095b138/15522618925.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/wigidabikupapovozos.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/12321704059.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f03fe740c47---zugogelumewidabox.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/edke8j0nuhlnetaip8m2l2ksp4/74940149135.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1c9407cf3598864a9fb831fc1d11908a/jidezerale.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/juxidelivitenod.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/boxubegib.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/3249176631.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/vezesepuwogusebepop.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/giwidevajagalijekurij.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/novaziwasunepotu.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ee3b9f346---fugunetipinokep.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/wunapobavemujezinebikubad.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_off0000b84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD061 10868 bytes
SHA-256: 5215f4f97752828cd27138fac2040ebb411be5a74d40b1b18ae98366cfccf5ce
font_02_sfnt_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 15708 bytes
SHA-256: f1d83bed6f4b37d5cfb61edd0a20d1909af8c58d7e5376308dd5af390e794368

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