Malicious PDF — malware analysis report

Static analysis result for SHA-256 79cb7e0978cf6efe…

MALICIOUS

PDF

75.1 KB Created: 2021-09-07 06:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ad4e91342678d2967d4bcddf5cc92ea5 SHA-1: c48f70735dfe0b1a5da4e083ce09df24b5a228df SHA-256: 79cb7e0978cf6efe3567d6e74bce994c2e910519673fc9911fe04127e6fe4163
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nnt52.ru/userfiles/file/fazigukelajamapekudato.pdf In PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf1f42df65---mupoxitugomun.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/48574822723.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166bbb8de9---mivubimedaridofibasunux.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/78422370923.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3243dce54---nubimaxibemogipoxiboju.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/45726083242.pdfIn PDF document text
    • http://jn-zhsc.com/upload/zibadabimekodedediw.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d8dfba74d---vitumovomudojomamolufala.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/jajozeboxefuzazi.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/nifaguwinevirekinub.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9d92a21f2---japosupexumirafesojog.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/74292624207.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/95313477895.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/lisomobisudino.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/4edcf99b0b7662dec1472419603dff00/4032825323.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/0q8gjmc0erjadj3s14sqfuuk15/kevutukogosi.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e7209f286---62002568335.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/96229088476.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/moxegabumesapuvumidi.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702d1ea3117---xawiladixuk.pdfIn PDF document text
    • http://cpils.com/userfiles/file/31290523272.pdfIn PDF document text
    • http://scro.ru/pic/file/39788453183.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d7317aa59---xezuwiniranixifojepavevo.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/jupuvuvatar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=worksheet+to+learn+to+write+namePDF 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_off0000c466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 10544 bytes
SHA-256: 504eac6ddc4cc1a527b8f5ff2abfa4a75a245f0856edb2542218968ac260adc0
font_02_sfnt_off0000f464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 16744 bytes
SHA-256: b1c86f451f6a33cacbcc39427e6c4e13d3c06960e81247eecb1eb6b2901b775b