Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e66770d3fb7040…

MALICIOUS

PDF

72.8 KB Created: 2021-09-01 02:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f09c688fcaa2fd26d4dd22eff125ef53 SHA-1: 6d0a6c7cf3f7a0a3c67e39316b0071ec565a8618 SHA-256: f7e66770d3fb704053f5e838a4a643235e1db223a107f3e22fc76f5e5b533f7a
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://chcial.ru/uplcv?utm_term=theory+of+production+mcq+pdf PDF link annotation
    • http://ilturismoinitalia.it/userfiles/files/26080096404.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/rujaju.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/vimev.pdfIn PDF document text
    • http://standdominica.org/files/files/39407162886.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210714_BF5A51ED5D50ACC3.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/nixup.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/befijewijavanes.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/4026ef2bb65fc6f012532a24d2658a51/76900738751.pdfIn PDF document text
    • https://aedwea.com/upload/foto/lirodejadokuku.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/d7ced5cdc651e29901ca1edbccb0b577/87361312681.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/84800625763.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e4f0be3342ae6cee27e829f28f0ab33e/84492039547.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/51d3720140646c2750f870389603100c/97667443701.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609caec7d8cca---pafegejexotanoniro.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/3a0sn15d4jd4atkfel6eu37bkj/96970882265.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/padasawatasaxodawug.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/43884036754.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/83424237840.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/05e92f3acbac998382164f1cbc10258f/wejevusagugaxilazoxek.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/nomadibixesupikeges.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/g6c6jr019v8geot3drkie567m5/16013986242.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/35010861876.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_off0000b8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E3 17052 bytes
SHA-256: 37a8b5d4c7cd6c5cdf8755f23538fb62f3ea7bb23e1267779043bd4ff8fefcfb
font_01_sfnt_off0000e4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B2 10832 bytes
SHA-256: b57dbc9b39e8765e1f090918fc4ef06fcc29c4aa8227fdb6cf4175045ec950a6
font_02_sfnt_off0000fd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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