Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5783105cf1c11d0…

MALICIOUS

PDF

75.7 KB Created: 2021-08-30 04:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6e655a8c14f576d99767d9845162ba0e SHA-1: 3531213df1e1a861863d6ec49876dc4c284c33b9 SHA-256: b5783105cf1c11d0c1ee14dbb0a06ac6df2b01352aa67ac4345989129aa26c6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised CMS uploads and disposable hosting, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=roman+number+of+10 PDF link annotation
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/d0ej1th8fqjiu27mmubl09nbt1/55727222488.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/1gtn3gk0l0j4m1j8eu6m3qsvc1/16577240971.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/82144541290.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/juxufaluxakifopi.pdfIn PDF document text
    • http://rld-carbon.ru/file/96133430607.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1625602888.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608abb4e34773---wobujedapaxaredipujadoxon.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7420a1ce31---dididobunefu.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a424138028---76087175832.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/cm7egqjot9seg5iamn2q47sc73/19956914047.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/5fq5hnkslbnogb6c8lvfrvvlof/83890882585.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/posulen.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/49342941000.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/77759748889.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/08b2ecb4f38f2ab56ca56e319e107403/77951667434.pdfIn PDF document text
    • http://llux.vn/uploads/files/kusepozaxofivaraja.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/90002701263.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/xiveliwi.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/71050340331.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/divaburukomemim.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/fusogu.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6892fd4cec45db5c3c6f5e03590bcfa/tusebiwejupesuzosa.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/vewemitag.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_off0000c548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 17084 bytes
SHA-256: 01c7739179d9dc5c62fbd4a8c853e5771d57cd3e064ed6855fdb480a660b39c6
font_02_sfnt_off000109a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A5 10432 bytes
SHA-256: d4de4dc3a40262330b189e3e45ee8422b549dfda0328d884e3175cea4a55f76b

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