Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64b1febb566fffd…

MALICIOUS

PDF

120.5 KB Created: 2021-07-18 06:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f847cbb4835a0e66a85713ef8e706b8a SHA-1: da674f29e14b5da87a4b6c048f1a2a7ec3645a6e SHA-256: b64b1febb566fffd487a1b667628cf0bfb855ee1c893da67f04fe370f7279ad9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, directing users to multiple domains, many of which appear to be compromised CMS uploads or hosted on disposable infrastructure. The embedded URLs, such as http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5bdb3171c---wazitunaga.pdf, are key indicators of this redirection behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://ggmtc.net/userfiles/files/rogalurepuvamomulez.pdf In PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7d7b4cadbed6bb6f6326a08f27da961c/51654018822.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/62917405139.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/eafj3g9j5vs45a5qrf19cc12q0/limopipulopelitarunobifak.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098301060b8e---97232515578.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/73548425397.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b0d7bd32e---81948271866.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ecf773889---wajenowopepix.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210619162406509296.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a0c8e94b589232ca03474c058e20b0cc/18122105768.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/c7f79ec385aabad2506bfc24116533e2/detud.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/aq2vif8amvnbkl9vovvpvh5he1/461194367.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/silosakiro.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/73968289843.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/7f6f275dca00ae407a53ca7e2d736fc1/18820137552.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/dowefuzel.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ab05648d2---30002053932.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe55dad2d5---pusazilako.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/91862983535.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5bdb3171c---wazitunaga.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160996ca609bb9---joxovarapag.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/11276700c26cce6cf360554cdf8bb952/8784636916.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/8d2b51b96c773e59bbf8969cda490d10/82758971536.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/88112820064.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/bizimobepemobuwawirofusof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+brothers+2001PDF 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_off00017896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17896 17464 bytes
SHA-256: d7507e7355e1ab7e6b46f3a43ae41616e4b74daec76005ef2ab09842c03129aa
font_01_sfnt_off0001a6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BED3 10196 bytes
SHA-256: 3e26ff794ac45bd1087b6d660f1e3d5323b70168cf44c1fc8cc210731dbec354

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