Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b26360dc185590…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 11:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 43b43e5587ed1e7e19cdb1eb58438e10 SHA-1: dffaeb5d098b96c4957e31fddab21e8ec3c2624d SHA-256: 03b26360dc185590df52380e21e23e96834ecb19691fb24b3fd17dd7be55e7d5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://trumoi-khutrung.com/upload/files/74927244985.pdf In PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/27259819317.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/61695122580.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/xopapukugadokopekeb.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/xizotedatodaxejideba.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130607198f8b---zadubavoriwukuvakinibax.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/sobifevofenisamevu.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/31223566885.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/44230849038.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/pesuwosezabogasena.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/0c41571e537e649295ae33afef682279/86465169285.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35149689861.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/04083f2440465454367c14c110c56abd/93641049094.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/52458415753.pdfIn PDF document text
    • http://dsfly.com/uploads/files/77957983632.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/49683787197.pdfIn PDF document text
    • https://resicolor.com/upload/files/11124393501.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/sarujuxeweropomigitujewev.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/gopebokukojerogadevupok.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/nakewaxoneluvixonixa.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/032334516243.pdfIn PDF document text
    • http://th-hl.com///upload/files/76860116439.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/jawuvesoxijifugulezizi.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/83531699846.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/27589748163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+install+android+apps+on+pc+without+bluestacksPDF 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_off0000d4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D3 11020 bytes
SHA-256: 5ccedf27b1d50812188a2734c0c45de4e9e6281c430ecfeae359fd1d0dd11488
font_01_sfnt_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 17760 bytes
SHA-256: 9f519945a6ab1ab9fd17de284caca4771dd55127a19d82921dd3035ad23717ac

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