Malicious PDF — malware analysis report

Static analysis result for SHA-256 182a412e050e2f02…

MALICIOUS

PDF

93.8 KB Created: 2021-07-29 23:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 25806574fa7ba1ca0748e399d154b065 SHA-1: 8f17f13e5a789013d8822b1e49b0a426c1db8c7e SHA-256: 182a412e050e2f02ec5539d9c2ac3dbee4769d3d6a2a7ab5929e3831c885ae73
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites, which in turn host further PDF files. This indicates a link farm strategy designed to obscure the ultimate destination and potentially evade detection. The primary goal appears to be directing users to malicious content through a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=dias+de+la+semana+en+frances+para+ni%C3%B1os PDF link annotation
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078ca9f11809---jozixukum.pdfIn PDF document text
    • https://businesslife.com/content/file/nabivukebafiveber.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/30341908643.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/belodapanozowusi.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/74874283692.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080edb8d7cf0---40878813361.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdc02babbc---fuzuxajofuxexa.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/78959360973.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/modatugusug.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca7182ce12---30112550818.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2b171f184---pupazajiputup.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/38lrb3hmbi8keaoihd5mqu6n7l/witerofimimogamame.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/96d773711962b70e66cbe31f76b1d631/61374082242.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/1014435069.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/728c871e6a8f1e2869314082a8796cf7/ribomubabu.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/43444624252.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/piwasapi.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fae7982f34e---vovomojilavosi.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e6f27713e---sabaso.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9fe31078b72e0ae94ad0d46a85eb8e2f/57796668946.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/4f2f837493a366a497854e977db0d839/taweguxogemigejum.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/rixabu.pdfIn PDF document text
    • 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
font_00_sfnt_off0000eaa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 17200 bytes
SHA-256: 67dd537b583d98f71e977fdb12880c35fc0d6f0f92218067387d5a6ad87f9528
font_01_sfnt_off0001037c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B93 10888 bytes
SHA-256: 7a550d597c6f79d1d6577b89d3d9654cbde3332d7cbb0766257289b7df912fff
font_03_sfnt_off00013463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13463 21080 bytes
SHA-256: 7b254c848a9fac3bec7a9d44bed7e8c4ecb602c2dc079154ccf53fc4975be825

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