Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9e85d9fea4936b…

MALICIOUS

PDF

78.1 KB Created: 2021-08-15 18:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cde2b8e0c7b60c8e56ba4a794ed4a496 SHA-1: c9310c2acff4425af70a1498f684c9c34fcb593a SHA-256: 7b9e85d9fea4936b0902cfdfd05a65691de8bc903a1ba29c5a1d00cb2353ab13
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607735053dbfb---foguwumejamovizabozul.pdf In PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/jenepizatasonepawoz.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/41737739531.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608be82e169e1---werusaw.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/26382373076.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/666ba8d792b01301c980bc93f0860917/68687851803.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd09dae62d---kejokamilalat.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/qg3laofmjivobf1erapij1alrp/38487763111.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/gekov.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/b8o267edg31b25s4prjt32opgm/rimevewatuvafanibujovuso.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/448976267.pdfIn PDF document text
    • http://punaide.com/userfiles/files/joloxadazusurusuwomosogoj.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/2qne585cbuj03en9a87c34r9ps/32255355730.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6381f297cb---kototigozolatajuxopu.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/2d470370923c1b43074df8b0257461d8/wubel.pdfIn PDF document text
    • http://iphysiology.ru/upload/salixemuridi.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7a0c7bc37---giparisovutome.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/ririfoxovozatefepa.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16105076d7ae4b---69607571486.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/lakatotepuravagixel.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/16043143144.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fcd7226b1---82736123611.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/cada8cf740aa5c228bde4505e036ecb0/fepuborifubanilezelumarev.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/seputunudomuzexolivuwuvaj.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/1c4026674ad98bd9898b79bcc7e642f4/8701930965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=airline+operations+manual+part+dPDF 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_off0000d187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 15880 bytes
SHA-256: f3d7aed9513b5a4080e4ecf1aab844128f387779172541cf1fa668d7e47712e6
font_02_sfnt_off00011255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11255 10636 bytes
SHA-256: f434285b2a2a36edccdcb07b206a0c4127396aaa2ef77cc90be396d3fdee5822