Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9bfedebb907c60…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 00:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 21d87f7c4190f57ab63fede539f66e5d SHA-1: 137400bb1269a9aaa34507f2218eb58039311db9 SHA-256: 2b9bfedebb907c60bf7b297abc060a6fde7d0a846f87922e8b56e8cad4cfd3a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0a9cd1557---zetumumepevefuwu.pdf In PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b982d86c615---kokodogevepuzuke.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/vudonagadabazom.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/92723601813.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/77826049489.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/fogusanemasebupineju.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16076df2804ac9---gevimavob.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e01cc6a990---vexedavakewasixitafur.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/binim.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/dedewemix.pdfIn PDF document text
    • https://schmitz.cz/res/file/99104776366.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/dudas.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d7571dcfbd36c9a0f18eeba498f43d2e/15174596865.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161206eb0002ab---juvasa.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/b35489a0a878f48bfa048e395afd46cc/52406533559.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03c4ba6a51---27257333777.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/0526a84cd85df5a27335009df37817fd/60302065748.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/nuxoramujaf.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/65339597271.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/b8a3868f1d714664199b17597a86d8f3/xulonalatipinuwesopagafo.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/14112409405.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/ridobejepok.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/feselepuxizeruralogut.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/82119133477.pdfIn PDF document text
    • https://saam.vn/images/content/file/luxefesopanikasugejali.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/lerujakerivuje.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/repowodur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=converting+jpg+to+pdf+on+ipadPDF 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_off0000d3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EC 17824 bytes
SHA-256: 049a8a241136e6bc21b33728555f0c122f128738fd2283849dfda7334a4f1baf
font_01_sfnt_off000101b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CB 10688 bytes
SHA-256: 669b7fd30bd71dd423e26bdc84a6411e0d1a861f3e4153c518a1507082ffa8e9

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