Malicious PDF — malware analysis report

Static analysis result for SHA-256 0454d0e5217037bf…

MALICIOUS

PDF

84.6 KB Created: 2021-08-23 20:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 05f941f0ec3a31a2113ea04418a62803 SHA-1: 426215a5fe3377a59f49c05e0ed55818c5e2cdf4 SHA-256: 0454d0e5217037bf3ee227ee5e3051612f15e7b6c4e79bf0e45b2864ed7cb85e
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ketchas.ru/uplcv?utm_term=download+torrented+files+with+idm PDF link annotation
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608580e293289---22139622676.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/lutururexugukoputuf.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210820_F2776B089F5EE5B7.pdfIn PDF document text
    • http://tencanpowder.com/d/files/62934241546.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/28190911771.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/sakelokujim.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/75451350948.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/fefojegepenatizonezetij.pdfIn PDF document text
    • http://industrialdevices.in/uploads/wijexajeleloze.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13151114f---25869483256.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/ximofejalavu.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/8caa1e96a779b0b8bab51616088a6030/natojumolu.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents//files/bifodupawijefuzovazo.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/xupisib.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/lunawanatijevi.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b3bcd43ae---1297343910.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/2r21ljjqc7ud8p2an1sa7rhbp7/sozenizitufojuxikalawape.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/4707246954.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/e839ps376kq54dviv8ihp3dk1m/41636885554.pdfIn PDF document text
    • http://rc-modeller.se/images/file///fixezaz.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/nedebarazokiwizisom.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/lefepavususem.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_off0000e4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DC 10704 bytes
SHA-256: 12c3188acbb88faba4cd4166873e13e0f37e7c3a423ec25e6d0c4a15a3cea0ff
font_01_sfnt_off0000fd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 17384 bytes
SHA-256: 5f5528f99b361c586329bdde823cd91a45e4a7960be51a1a477b158c41a1e4fc

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