Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd992f3f9787370…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 03:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 04e785f6819090e151858af254de7466 SHA-1: 7aba2c7ed5d4e3112f58557616d480028f3a2ce9 SHA-256: 8fd992f3f9787370792849f4e80e77af177e162ef742eabdf5355b9460c997c6
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, a common tactic for phishing or distributing further malware. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The heuristics indicate a high number of distinct hosts, suggesting a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/3a65973d620ddbf35481cd4ecf3eeeec/5611217833.pdf In PDF document text
    • http://birzebbugastpetersfc.com/files/file/88214820183.pdfIn PDF document text
    • http://w-mill.jp/images/file/gadesafifigepanujo.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/48052879354.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/89696805863.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/75963943158.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c3b0b6443---siwusebefasekutuka.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160943973b4fa8---61241947331.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/1416bc07008aa236484731d8dcd5fdc3/25507275141.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/0480282ad7823890341a77c066eedb6a/mevomi.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/zixupusas.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075a87132508---30828221555.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e55901c623---sewifugakasubinunatunazo.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67213133620.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbab540357---19878140334.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/9dio95705ffs64dc7v9h4odkf3/61167902594.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/39893590200.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f7d755cb8---6293321075.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ejbkk4vcnegnmm4j9gnaijmeoo/60548861350.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/4235bcd1f2c8199784fd69d2aec47b47/falovuvuxogeranovikegu.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/lefagu.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/kunadovikadezaw.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/48055463377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=automorphic+functions+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_off0000daf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 10628 bytes
SHA-256: 2d045cb1a8de76fe15c684fb95c354911e4f25cd2f859514052fdf7507f9563e
font_02_sfnt_off00010b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B23 18808 bytes
SHA-256: 4d0048573232ca2eac0dab28dd760f6e913546c669fb3e2732039b34d8428cf7

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