Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0870b86f6a30d90…

MALICIOUS

PDF

85.0 KB Created: 2021-08-15 03:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e03ed0da7d0476af82fe13f52c7c729e SHA-1: 0eebf7c650ed2154c7a156110dbaca4b40779ccc SHA-256: b0870b86f6a30d909c87420a7187cb4e7506fa33d6d0b7b9a194ca7bd9d90093
176 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'lure' heuristic suggests the document attempts to trick the user into enabling macros or editing, which is a common tactic for malware droppers. Several embedded URLs point to potentially compromised or disposable hosting, likely serving as part of a link farm or to host further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further reinforces the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/gsb4uqdkmr2saosvt7cpej6tu8/86806663160.pdf In PDF document text
    • http://stark-tools.ru/images/uploaded/92938988451.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/niwujadobomoxonijobawem.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/83900745990.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/milomerawizewuw.pdfIn PDF document text
    • http://www.centralperdana.com/file/88368940087.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/pixidim.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/jifigegojokugil.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/79681730310.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/labedovi.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608882cc328ff---65959634221.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b11a4028---fajigitewivevifenetu.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2fc925400---dilisakagaponadaxoxavije.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/16845099918.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e78db6a5c9---xopoduduratakugu.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/6091818654.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/zelelekopiretoworisil.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/sudabebasigedamagiji.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/vosunuxufegamivevo.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/20d773750e3b23daf53df637a482b592/riteru.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f635636e7---wadix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=macro+convertir+chiffre+en+lettre+excel+2010PDF 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_off0000e2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 18244 bytes
SHA-256: 844f0bc048cdfa72ccd51864d0666e70aae4ea55a90a591b4ae6eef9aaad54ad
font_01_sfnt_off00011266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7D 10720 bytes
SHA-256: fc4eedb848417ec6af7418c5b08ff76500a709c6085ca7f199a14c80045d4bac

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