Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b2c5deef8262b3…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 14:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b2da4e9ea6640544d2c1b8dce8dbef75 SHA-1: 57a2859034cd0c53cfe7026e28b8ceac2eeff47d SHA-256: 79b2c5deef8262b330c876be5d8c685fed66415c38b3830793125c4cdb165bf4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, embedding numerous URLs that point to compromised content management system uploads and other potentially untrusted domains. The primary goal appears to be directing users to external, malicious sites rather than executing a direct payload from the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7434

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://snieznik.pl/userfiles/file/7039149449.pdf In PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a86aa69824132e32214efc26d50b7724/labegadisukabuwepula.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/naluzolekezelewore.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/10271208403.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161319995a085a---45171216839.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/masodu.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/86738975785.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/kusolekofar.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/75185156123.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-12/20210912044953238408.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/sovosijozalizatamodanox.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/dotunegajixajononejidukun.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210918233142.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/pipujazerevazozal.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/22122649051.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/jerovoxoreforob.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/54279322655.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/runege.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/kewomepube.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613005f572b93---dinekegegokixetu.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/situjewogusuxorom.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/90903698326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+hack+online+games+androidPDF link annotation
    • 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_off0000d34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 17212 bytes
SHA-256: 02ddb081352a2e7e2ce52dea114f14ddada3ca338908a4acb39e1ab2fe2aecf3
font_02_sfnt_off000117fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FA 10984 bytes
SHA-256: b5f814eea886a2445f32dff98b583df9788f22dd6a827524c6cede035f45a053

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