Malicious PDF — malware analysis report

Static analysis result for SHA-256 936eede79a4276ab…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 23:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 2b51bccfc22e8c18adc606c771bcb355 SHA-1: 68cad213e7900e6949ec2978c36d3e3abc0b0d4d SHA-256: 936eede79a4276ab1b1ba6c2eb3d64e08ac6acf24a53501f0084593c8dac2a90
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4151

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://joewhitefamilysite.com/clients/59967/File/bowadovuta.pdf In PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/25152151223.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/0a31d917cb78a547aa70a0f8793b37e1/4514309588.pdfIn PDF document text
    • http://rayer.cn/d/files/fikujag.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/1741ca18cd7a9e3fd1857a040954f8bd/80194379965.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/96089856488.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/napubusakugibi.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/21715483591.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/guf7jp6o96bja70lbs08qf2dq0/1557892083.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e6d8b391c51218b7d1c7f6771f331282/zuriwawiluwatolivatokiji.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/kozuvezodatumokixu.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4414d24101---botapetolivumozedu.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9c5319e2b---72394887768.pdfIn PDF document text
    • https://giustofiori.it/file/25933087470.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/kiridofinasupexixifoz.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/94799985621.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160928c4c9da14---48219068444.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/36594107698.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/58069654400.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/25639624793.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/sutolazediluvugulibupu.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0685ad79b1---diwik.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/72238881544.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/nifapekepobaxoxadixu.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/2r3qe7j9n46ko249572lc3nm8h/bonotidubigakerowipeta.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9c2919418---88973675397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=lise+zarflar+test+pdfPDF 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_off0000df22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 10284 bytes
SHA-256: 65d2af39103f4d4ca3b2fbb0af4cf9b511fe8e501d09a3717bd01b0556563741
font_01_sfnt_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 20380 bytes
SHA-256: 8ffd4822c297f83651f646d760cfa1ab5be8a9f90170eb825e4cf38395f9fd8e
font_02_sfnt_off00012b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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