Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11da46bc3500b12…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 02:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10a4dd728712914f1dbf788f800ca66c SHA-1: 4610437048eba4208a5642fa99e040448ef8dd18 SHA-256: c11da46bc3500b122465280e1b6691d46856e2cad8540c974d58a4b642823a96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of external URI and link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://plagij.at/ckfinder/userfiles/files/simixokufalirozunor.pdf In PDF document text
    • https://burgas-remonti.com/userfiles/file/52376200274.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/39073186249.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/78412836703.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161351f6a11600---63992391770.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/49920304340.pdfIn PDF document text
    • http://bndweb.nl/upload/files/zolugu.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/gazitopejikuzijut.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/gatejurifadopefupenaposow.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/64573193745.pdfIn PDF document text
    • https://sitarasign.ir/data/file/sifadidi.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/51640217861.pdfIn PDF document text
    • http://kes.org/upload/editor/files/dazowuba.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/kijezi.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/sb8cdjrupob9h0guhl2gtaoadq/55525135672.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/vofinosovatuzadeguxek.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/23381365208.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613396de66264---81184568823.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139466e4a79e---2307648802.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/89812467355.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/71296500124.pdfIn PDF document text
    • http://119pump.net/d/files/15940540920.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/jowumesulubefodi.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/76096903209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=tamil+music+on+app+mp3+downloadPDF link annotation
    • 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_off0000d0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DE 18320 bytes
SHA-256: 07a94ec94d2e82c1e89b7de07e32d8ea5f5c24bc3e86e2e52214f4ee1baa97fa
font_01_sfnt_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 10668 bytes
SHA-256: 418abfafca9a6582d52c2dda944a22e15dd7a761dcdc8921637367b162746961
font_02_sfnt_off00011853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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