Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9dfda017f1eaff…

MALICIOUS

PDF

83.3 KB Created: 2021-09-10 07:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fe7dfac5719c8f707a3b07a17fc9bf0d SHA-1: b1fc0d509b96f8df64441e5919c5a0fc5e50d0fa SHA-256: dd9dfda017f1eaff252513685a1dcf7fa0600c659df62e956484e29aae038505
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. The presence of a URL with 'utm_term=best+telegram+apk' suggests a lure to download potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://nomylo.ru/uplcv?utm_term=best+telegram+apk PDF link annotation
    • http://saxonrt.hu/img/userfiles/files/jafizakazalokadekerada.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2a89297dba7b6760d2243ce7fb6f4232/sajawepagemosapasop.pdfIn PDF document text
    • http://timebymtm.com/upload/files/rogugalenamesajeguro.pdfIn PDF document text
    • http://p-energo.ru/content/file/dasamitujolebikopofowog.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/zekumifipamiweweke.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/dulovafizinut.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109050446093154.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/timubefawon.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/90336671227.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/xazadijevaxe.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/78508938360.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/tanabepol.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/bijirimefusifaxe.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/makupepedozuxagojuxunufu.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/90605541737.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/cc9cfd09995dc072d23fef365a28ca2d/32322631969.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/taxubedopokisizijexe.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f077874371---33619556670.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/rajozi.pdfIn PDF document text
    • https://zzhqhi.com/d/files/varujiseriku.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/14004759619.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/7171884618.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/50366633504.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/xerosom.pdfIn PDF document text
    • http://bankerz.in/qpic/files/69216839447.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161334212856b3---41779706733.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/94484819847.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210907094540.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_off0000e0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 18244 bytes
SHA-256: 369985e9c603b8595fef412c0aa32a6cb4fce8a9416dda8bccb0758956873341
font_02_sfnt_off000127df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DF 10424 bytes
SHA-256: 477b3be9bb38848075fe14c573a6ea34ef927306d45d91a9c75bd9e5d8ec196e

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