Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb8609e22b30ebe…

MALICIOUS

PDF

95.7 KB Created: 2021-07-20 21:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3a7be85b959452de87e31e4a1d9e6266 SHA-1: 4f75471cfe36dcc3de8bb15a84eb4383996fe617 SHA-256: 1fb8609e22b30ebef65bbfecfdd5a059e1d96cc241b97dfd3d104c337e0a1654
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to WordPress upload directories, strongly suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/af8261uv712iubb9qigkpuede3/vigusexeganoritana.pdf In PDF document text
    • http://bright-mineral.com/uploadfile/file/2021071515281012.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/55959397767.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/38351763394.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ced78460c---bekedefidomux.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/rufokeduximagosiramup.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/79535010408.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/77092076921.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/sivadomem.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfde316665d---mapupoj.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/xediwu.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/23025393190.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/u723lomrp61iemgk2m1o9327f0/30254048201.pdfIn PDF document text
    • http://e-hane.com/files/45229750256.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/m65qilg1k95smncc52uegqk1ge/96060999586.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/69412125169310cb9f4aa6e7a4834219/79374185477.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/85243205210.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6b73c0c5e---19477176224.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9d3171dd5---wabutuxofafuwigatuwa.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/16549831715.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/ddddca17c695a20f1d78f5ce56007889/jajigagusifutegumigefef.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/5e75e015c14c477b4f3c1badf6def734/76575054620.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/utlten0d09up71cnqtg42bn7d1/lumimi.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adc430bbec---bawaluzavoxad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=bill+nichols+introduction+to+documentary+summaryPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000ec31.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEC31 21248 bytes
SHA-256: fe7a327f721a248eb7fcd2b6f5d8b0ca7f505ae21e637e0518591226d41e4088
font_01_sfnt_off00011245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11245 10904 bytes
SHA-256: d89d7523e2868769ebf3876c96a268fa398be8b1f57a4449ec566d63f0ebd243
font_02_sfnt_off00012b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B56 17856 bytes
SHA-256: 2e0f21e0cbe367518d8c1e8c9b3d855242ca855ac25c16c8b68e613f1e436623
font_03_sfnt_off0001589b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1589B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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