Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fd6604fcbffc86…

MALICIOUS

PDF

92.0 KB Created: 2021-08-11 20:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cc95731b0bc7e24cc81b1f093282d9b2 SHA-1: 03e8daac79a5da13638b2efcd1ee00ee03368a62 SHA-256: 37fd6604fcbffc8654e1796375b2861e7e4d2051a4a07644fc9b665c23adb9eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to execute malicious code or redirect users to phishing sites. The presence of a link farm pointing to multiple potentially compromised WordPress upload directories further supports a malicious intent, likely for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inmaabiladi.com/userfiles/files/99953274954.pdf In PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/d64e9eb680fa4bee3288b1844ad6f728/26376587712.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/zufebelufas.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/4ebf52bf856d62150ad4dba5460dc434/43979044760.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/vasujofukorapiwapukevovo.pdfIn PDF document text
    • https://atiksigorta.com/files/soxebevagolob.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/rerugatetidaximosuru.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e61fd47a37---gimoduverexajirujisot.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/1d7ab005e0d2b3cefe21c05aed55ed02/20517974218.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/binip8j9n2chcatdfnr66glvp0/nefoposonufegijijozus.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/gajosupufopazobivumuge.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f4168d1edb9---xizuvop.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/577882965.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/8a14769f9db522656134779954daea40/56668447732.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/70737559699.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/94924731804.pdfIn PDF document text
    • https://haidangpc.com/contents/files/mukeluvake.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/82874524762.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160807ce818d19---50748045282.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b59bd68db---45201061352.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/36354167551.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcbbc25095---69291852519.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/lafotatidatezepalomibeju.pdfIn PDF document text
    • http://i-dron.cz/data/file/denixewabega.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbe13e01a8---nuxefilaxijogajukitesomev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ejercicios+de+ortografia+para+3+de+primariaPDF 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_off0000fee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F6 18920 bytes
SHA-256: 47bf27ac2facaeb5084fbe6bc2c3750c832291bc7f8ecb4f7980eb26d682b8b8
font_02_sfnt_off00014694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14694 11100 bytes
SHA-256: a4a2476b0f281d6b21fc22bdb12a387d578dbbe362f2dffaff48c5918bdbed8c