Malicious PDF — malware analysis report

Static analysis result for SHA-256 250983de3496ab51…

MALICIOUS

PDF

92.5 KB Created: 2021-06-10 22:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 83b93082294b241f6fecfbe38002966d SHA-1: 2750dc2429ac96837e3db9bb04361695e1294618 SHA-256: 250983de3496ab51cb16284c42586c20566e266feef9bde3eb0bebdbf45ceb88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. 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://garglob.ru/uplcv?utm_term=tamilgun+new+tamil+movies+2019 PDF link annotation
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/f284ffa0e070dcdfe6fb5d16b5388eac/sowaloradumo.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1e2879d55---98439198439.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/webexaxedigugi.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/0e905e24ff614defc9ebfd3c264c0390/kaxopoke.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d618d30bff---fizuvedi.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88390a9690---90187045898.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087b5628e531---10782235328.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/18811299616.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089483cdebb3---xevewazumusikofugilalub.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4747dddbf18d081296d1c63011d66943/53008423266.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/jcqljub55bk5q6li5pvua17ccl/3857350328.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/iqi3a57m7fmp04jhmcls6dufb0/mebafera.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/4796706960.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad5dcd949b---lononefozi.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/46aeaea2ef933b6630d20d96d915f00f/mezinulena.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 5492 bytes
SHA-256: 2e3e55fe03703d33d4ba2348b23411ff905da90adddaccb94200f618a7910098
font_01_sfnt_off00011b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B51 2884 bytes
SHA-256: 63d3c14c062055f4346c745b9a94f97525b16913bf21c890b8c349cd60a4c159
font_02_sfnt_off00012736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12736 11748 bytes
SHA-256: 840e02ebd1bd4e523291c520b21e92f4086d953fd451abc3fb9d2df023ee3119
font_03_sfnt_off00014f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F67 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e

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