Malicious PDF — malware analysis report

Static analysis result for SHA-256 571326e5a2b801b3…

MALICIOUS

PDF

92.2 KB Created: 2021-08-05 04:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: be8dc13d0106b02075781b3af729d4a5 SHA-1: 84a1cbb3386cbaebfd6106ce59a02ef6eac67b26 SHA-256: 571326e5a2b801b31b38f5377d4bd13610d2037ed41caa6395379ca36724c179
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, suggesting an attempt to host malicious content or phishing pages. The presence of a 'download button' heuristic further supports a lure-based attack pattern. ClamAV detection as 'Pdf.Phishing.Trojan' indicates a malicious intent, likely to deliver a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kalmi.ru/upfiles/files/23249355174.pdf In PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/96928173700.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bdab11653---62442347586.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b44884cca6---64656023353.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16102baed90b04---foxogazobejazanaporero.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be1c706501a---nakuribeg.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb3376be84---faduxutatujudadefuxi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4f0782bc5846b0c7e77bb54eaa9deb20/7473113318.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/30135056436.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb2b8258bb---dusifi.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/f1422eeedefe3ed16152486a89d422f7/vofejokuverajevufivezefew.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/ad31321cb14251aa83166521644529cf/taponegifidanidepenineno.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/sozudivutenafofi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65fcbbd163---favivez.pdfIn PDF document text
    • https://digireg.sk/upload/70977410679.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160f303d986c77---jekipebuzorudofitukuk.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/wokavo.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/xagolafubasu.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de7fa0b888---59717085459.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/u68tn6o1ork4kck7ojj0kh48n1/jogidufipifelom.pdfIn PDF document text
    • https://soechi.net/userfiles/file/34155569987.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/ratubafanipanu.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/dirorowenirijoxanalilo.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610578ba16f53---50668359526.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/35725161316.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbe0b98bb5---jitunem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=super+mario+bros+64+hack+rom+downloadPDF 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_off0000fd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 18988 bytes
SHA-256: cc6887eab62ca4000d50147e01d54ba8df3ed52aaf19d4f5a91a8d6636b2f070
font_01_sfnt_off00012fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBA 11420 bytes
SHA-256: c43f2d52f27f403c6cc9b56290a24a67eb4e76f9cc592fd997ec1924fb1a5145
font_02_sfnt_off00014a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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