Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a54899bb4c56e3…

MALICIOUS

PDF

85.7 KB Created: 2021-08-27 08:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8441cfc07b10016b61c00a08eca9112d SHA-1: cd9fbfaf6d536a67837a5d25e7b217ced141da1a SHA-256: 89a54899bb4c56e342d096f131dd4e18122a7df2460cc0304bcfc8221bf8ce46
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and a link farm heuristic strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://deforma.it/userfiles/files/tewafejowujujimubanofe.pdf In PDF document text
    • http://sinsg.com/files/fckeditor/file/jarufikeri.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/23939425528.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160960403232ed---garanebo.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/78965577254.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/90168074343.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f7b86b3f6433a34c0fa44fcaf713fa75/dejixanoraximemitevako.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/80f6dc60a8b7ff15fa2dda4b54e82722/vefukoborileguwexijebi.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/59031391114.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad5d408b4e---12117020738.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/46853950773.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a54a302338---bakepagiwagemexipemi.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/3279731058.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/kuximalizetavigerokes.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/nebajowofaduwiso.pdfIn PDF document text
    • http://st03.it/userfiles/files/jomimujuxalila.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202172231539.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/lodoxovudowa.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/likasonirefivel.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0b3da2d95---22670523583.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf60980b22---godizodupudagofokig.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/o051fps05km8peg92mp9q6nj52/11789942365.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/83122894162.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/e29466ab0fb182c6dc05e344c0c1418f/98574426681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=airdroid+for+pc+download+freePDF 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_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 16800 bytes
SHA-256: 8566bc90589ffd402108bbf2c76ede9bbf3a911ef3f4ce0646dd0a8941cb973f
font_02_sfnt_off00013078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13078 10412 bytes
SHA-256: ff38b1cc1ee23536593153f7762e5b8287fdb7bd632a450afef82b99737c0fcc

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