Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfdb9f5d89fd761…

MALICIOUS

PDF

83.7 KB Created: 2021-06-26 23:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd49ae623fd43e10c3836434ab1c508e SHA-1: 24a70be2baeff5368386e30311b8f2513385a936 SHA-256: bdfdb9f5d89fd7612d5769915975f64a678cb1c71225280ffbeab1799d277153
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially malicious content. The primary purpose appears to be directing users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://allytemp.ru/uplcv?utm_term=how+many+cups+in+1.5+liters+of+water
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/30d142cfd01eaafd78a38422b99f617d/43087051196.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869a11ab6ca---xugitobozuvoxisuluj.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6028868f6---fakokevagabefebexuguga.pdf
    • http://lycee-elm.org/userfiles/file/fazumes.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/bisemebidovin.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/4fb2d3bcfb30ae91f17c1099084a3c6e/bodusugabonidobaw.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210625063047.pdf
    • https://mides.vn/images/ckeditor/files/keveja.pdf
    • https://topinsolventa.ro/userfiles/file/60954975216.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4fed5b96---kavudexi.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f79fddc6a7---vokuvu.pdf
    • https://bostoncake888.com/UserFiles/files/77470143743.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/gifemozoxisefojomunijas.pdf
    • http://bronia.org/userfiles/file/23466790180.pdf
    • http://erbaytag.com/resimler/files/71824708974.pdf
    • http://fijiembajak.com/uploads/ck_uploads/files/38903835898.pdf
    • http://aquatrustfina.com/userfiles/file/xadisetidigibugorase.pdf
    • http://unipsyclinic.com/userfiles/file/20210603014642.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098f93c51927---zozasexemefasisuvedo.pdf
    • http://simonide.org/userfiles/file/felolabobojawupabizib.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a580d53685---molawagexopojamidofiv.pdf
    • http://houstontca.org/Content/uploads/files/47467362549.pdf
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/59516768169.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c746beab37---pupox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD80 16792 bytes
font_01_sfnt_off0000e592.bin
8dc384b4604ff5d335c2dd9f8164064602d62b3cdd398bc32dabd44f307bd773
pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 16572 bytes
font_02_sfnt_off000110d2.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x110D2 16252 bytes
font_03_sfnt_off000126b3.bin
8ea41892fa7f7429e3a28d0258cbb15a98a5f9dad4e391609597615ff9d281c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x126B3 11184 bytes