Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e26476af3a0d733…

MALICIOUS

PDF

76.6 KB Created: 2021-09-10 10:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b742e91fc8539fae8a4628a16b5bbf04 SHA-1: 1cd0632f4518dd6a593db3168bb42e7d2b9f4630 SHA-256: 1e26476af3a0d7336a5c9b864e3657e8b160d7e8a03838c329814e7edcf50936
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to various external URLs hosted on potentially compromised or disposable domains. The presence of 'utm_term' in one URL suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://coretry.ru/uplcv?utm_term=how+to+see+internet+password+on+phone PDF link annotation
    • https://rsun.pro/admin/ckfinder/userfiles/files/mupevumupukepavidekid.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/tilubad.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/netunoxaf.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/pidogulaxiditavilanomamaz.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/51692963052.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/nmuorqs2louokr6m6mntae08ic/5691150386.pdfIn PDF document text
    • http://tano-cable.com/d/files/61720979761.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f069976cff---13361311075.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/94887869743.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/popibojevewo.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/79320525159.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/gotaraduv.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/jufibenememamuniwise.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/e9f87190df0ad8ad01236817e409827c/gabotarevawofolaxoru.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/20583502851.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/melilala.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/68628639029.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/woditofexadijo.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/rivenakuwujosidog.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/2962479911.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090417490273499.pdfIn PDF document text
    • https://penal-garazh.ru/files/revopufa.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/75904058653.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/12862103380.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/53971924704.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/63268200304.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_off0000c863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC863 17004 bytes
SHA-256: ff058b2d793d3e8a1993763e57dc69bc9702568f0c48753f5ece10fdd071946b
font_01_sfnt_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C62 10520 bytes
SHA-256: 3bde495aa99acb4753bed4197e83aed434e195f9be2048c5ac987a46cbc0251b