Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0b3984590229df…

MALICIOUS

PDF

78.3 KB Created: 2021-09-07 19:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0059bd04bd52e5efa85b0139642b0f0b SHA-1: 835facb9233fe16fd37acd94eac99a0e9568148b SHA-256: de0b3984590229dfe1226ecc18767c7a02513e3157604a64ba7042ad53631bfa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and a link farm indicates an effort to redirect the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://oniceh.ru/uplcv?utm_term=airway+manual+general PDF link annotation
    • https://songhong-thudo.com/img/files/pimomoxufuwaxox.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/liroxi.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/89245603037.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af87ab04f2d---32387431601.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d6334a7857e---suvegan.pdfIn PDF document text
    • http://hodori247.com/uploads/files/minododivigawagewupak.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/44551097360.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82e4322de8---terevorosopemofivij.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/sugoxi.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/venonoxefulogu.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rifesarusose.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/ef93d062cfada24467c360cc94c286f7/78280047277.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/26926493568.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/45026880663.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/521f776cb840f1cb827f9a66d13e01fb/bizedofozumixavinim.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/76615818429.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/15767043429.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/045724108c54619d4143fd9abbe9d56c/61254058371.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/84e6f5e9dc445ae2ca2499e0e075275c/44518014373.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/54164426109.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/b8e4eb887b8527ffac21f486a232098a/wepufugupupimezinap.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0c41ee657---41998332254.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/f2b1624c9bae78551d0375d2e2ba6665/bopimexexibu.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/botij.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/28388726441.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/dirimajutani.pdfIn PDF document text
    • 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_off0000ce3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 17736 bytes
SHA-256: 88d15b88d9c609e1419e607a2f28a12d4bfa0a56c43a91e0a3d05590f49613cc
font_02_sfnt_off000114e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E2 10348 bytes
SHA-256: 638303b9edeba2652e25d61f70e431be334cff3c58f37e8277939593c70f36d8

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