Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a889098d7db5a4…

MALICIOUS

PDF

94.8 KB Created: 2021-10-07 20:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 21a71e2dd804b4501e29e0433e993451 SHA-1: ede64468b40867d5e593885160b9809ea446a4ee SHA-256: b3a889098d7db5a4beb4b1862ca913459b9311aaa35b1bd4d73e2d35c5a5014f
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dwornawodzie.pl/userfiles/file/junotowewirivefoxikug.pdf In PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/35920032363.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614ed4c1dcc95---golaginasovuxewojo.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ed11949b38---24123810355.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/21842190194.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614483f24be44---92111205782.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/dofotategizoviwak.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/debiwinutubaputufofoki.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/wakuterilupejaz.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/xazajobabi.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/61582385976.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/67824997546.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/mixobupaxidamegovepupugu.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/zanaki.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/zoweveginu.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/nifagoti.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/koxokusalan.pdfIn PDF document text
    • http://midel.me/userfiles/file/15583355860.pdfIn PDF document text
    • https://tomas-music.com/contents/files/nerimuwiweparifefuwaxavu.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/87692305113.pdfIn PDF document text
    • https://il-gusto.com/images/file/wofomuzoxaxojikurenifa.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/9v9smvtb871nbc9s6nmmmuts07/jadupu.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/pukugo.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210912005342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=poorest+central+american+countryPDF 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_off00010a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A55 10608 bytes
SHA-256: bc510b92703275f1127abf6a37a584b347973886d064a17cb71d889e83eec6d3
font_01_sfnt_off000122a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB3 19500 bytes
SHA-256: 3b061f78e4f9a2c51e9ca8460ca33c42085e73fd0ae7e1d3e292b6bb4df4c115

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