Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2a279ebaa5ad23…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 14:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 15e606a74b16f234f81cd86f424cde65 SHA-1: 1d95d1499cafc19c6a7dff88cedfaf0b46cdb087 SHA-256: 9b2a279ebaa5ad23bd555b6d73afbce3e4b868d3987569afbbeefd5a644539a4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the file contains malformed exploit streams and a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of external URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://queure.ru/uplcv?utm_term=call+blocker+best+app PDF link annotation
    • https://kuni.ro/app/webroot/files/userfiles/files/89703191246.pdfIn PDF document text
    • http://samtekelektrik.com/files/830223170.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/38171841.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/wuwatebupamifatebuxeron.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vevuxiketatexi.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/45861830197.pdfIn PDF document text
    • http://sergeybazarov.ru/file/12907841269.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4201b4dc0---81536778519.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/wotetis.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/94008884447.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/8132022244.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22174851793.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/suludulowa.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/xinebedusux.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/savozegozamudifaju.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/rotenuva.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109040836071024.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7d8570c8a---pewugaduna.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f15d61e11b---40478408464.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/xenabujegiwufiso.pdfIn PDF document text
    • http://soles2walk.cz/data/file/majivedelajakulila.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/83012930885.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/murimilafomopujinidume.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/mifomukiwexarokisobomefu.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/sitiwawagupolatebulojudep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 16804 bytes
SHA-256: 9c7878ec7c1bf411dcb0b091be5427c99de727f47a17c640273241be99b87e0a
font_02_sfnt_off00012213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12213 10436 bytes
SHA-256: b505d286624dc04f83c008339a2ef5e16f592bc1087b49800d748531b662e837

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