Malicious PDF — malware analysis report

Static analysis result for SHA-256 25886fe7ead73184…

MALICIOUS

PDF

86.3 KB Created: 2021-09-02 00:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2505504d3fa19f0fdac4ca44cfc1fc4f SHA-1: 5baae4614940e7ec8cb42cabfd8fa85fccb03210 SHA-256: 25886fe7ead73184354dba0bb2ca07b25f903d1ae9d5cd2ee8ee6400406f48e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple external URLs, some hosted on compromised CMS uploads. The presence of JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect the user to phishing sites.

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
  • 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://heyratacademy.ir/file/muzakoborotofawewufogoda.pdf In PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/dat0pod9a5vj79hpk6loa7e8lq/69772192991.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/94bd50170b87366af8574b2e9de759be/fojexujuvigikanuduxobujez.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc1a87cd7f---mepagumeruxipepaxatixapo.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/bbbc1847771d8f6f9ba75b37fc001c94/revaneja.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/xonelemetik.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021081109123842.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/95499783877.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/zumujasevubulagolif.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/84625288337.pdfIn PDF document text
    • http://skolky.info/foto/images/file/54478287478.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/81073245403.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/27381462626.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a818f73807---70641477015.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a3ed541e6---ruxomowavivor.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/14246463955.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/parifi.pdfIn PDF document text
    • http://afro-safari.com/upload/files/4384305951.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/221b2f2ec53abb0c6a508198378f9b00/posototubowoparewifijoj.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/49107316959.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/umjpdmuo4glh0rnnlnujdd6kt0/96769165525.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/51993205811.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/3390955541.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/51755160329.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdfcb6c6f8---rubaboxijewibodaxixem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=computer+science+final+year+project+topics+with+abstract+pdfPDF 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_off0000e68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68A 18352 bytes
SHA-256: a81880fb196152e4a85a1bc664247f833585db37e474a48ee9ecf1fb5d411ff2
font_01_sfnt_off0001160f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E26 11484 bytes
SHA-256: 5629ccaddb4add512993b9a2b6255575ac7dc956b59f1d2f632b43fb2bee6549

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