Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d3b87615ab35d7…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 16:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f2d58968663557dc1e3dd7a90a8b403a SHA-1: 23ad2b458c03bee308148a99b8645d8744626d0e SHA-256: 43d3b87615ab35d7ffe73c67d24209c444ad030c67de8265a52f69c5d080f2b6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download an archive and provides a password, a common tactic to bypass gateway scanning. ClamAV detection and ML classification confirm its malicious nature, suggesting a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://interstroy96.ru/uploads/files/popemoduresosuwawope.pdf In PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9bbd15cee---fepidoraroresuzor.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/93593617615.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/61167430483.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/50727496087.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613c32571d085---98445337174.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/saloradimo.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/lofiriluw.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/loxapevadegofozu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ede8de15b---kilezufa.pdfIn PDF document text
    • http://terrietanaka.com/library/files/fidofokipofumu.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/47093332899.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/fizemitisakexiriva.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d668d3b607---33709600326.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210919171408.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210917_BC80A8FF50F61B10.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/gvkglbh0ahcjm4opfg42tn4aoj/88618201361.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/lenir.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/jemufiwurosu.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/kexev.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/41445798468.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/10143590847.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/46389224090.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25108360149.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/6831e4dc696dd4d142a01b75cd66fc7e/83548928071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+see+saved+wifi+password+in+vivoPDF 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_off0000de74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 10588 bytes
SHA-256: 6f156df5dbebede4d3b7949ffd0911ae78f4269193d0a20e46cb9b718ce49b0b
font_02_sfnt_off00010ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDE 18116 bytes
SHA-256: 67ba5c494295764780edf55442717419369a2360773217395433ca918d171b5a