Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e13715ab15879fe…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 14:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f0740db2f9a12f991be9a7bf528b613e SHA-1: 6fd90839e85861b0725cbb06287bd355cbc25237 SHA-256: 3e13715ab15879fe9a1239feea0ab23b920cecd6265488442cf69ca72ed2f5a9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs are designed to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16137d86121032---3794139905.pdf In PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210908153114.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f92e51d94---50039140247.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/17167376967.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/lixug.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/62072bac5d046360bccba28a2fb32e1d/pifuxuxijutugetag.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/47868179227.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210921081430.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/debuz.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/30894164116.pdfIn PDF document text
    • http://myhoteltrip.com/userfiles/file/93997309860.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109161722002088.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210902204714.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/jimejisutaduveza.pdfIn PDF document text
    • http://olympusflights.com/files/files/68613854296.pdfIn PDF document text
    • https://indiansecuritisation.com/ckfinder/userfiles/files/vuzezul.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/47527848612.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/72263025773.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/56747302794.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16142f0744ec3b---97607132954.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/6058767156.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/bivovupe.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/rifunaguneta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=world+best+weather+app+for+androidPDF 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_off0000d913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD913 17260 bytes
SHA-256: e4ffba797a98ebb26cb806fb92692c7c17103447afe1eac4b524d57b25d18d64
font_01_sfnt_off0001056d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056D 10816 bytes
SHA-256: 79e3217f0d0765cd9d804b2e83c2db27e7865237cfa556bd753a3164e4f3e347
font_02_sfnt_off00011e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1