Malicious PDF — malware analysis report

Static analysis result for SHA-256 34027521e370776f…

MALICIOUS

PDF

111.8 KB Created: 2021-07-22 19:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 822e0cf2378e8e4840a50a724d99ec27 SHA-1: feba6f5e8d6a07a70bf76ac3bf4726ae087523fd SHA-256: 34027521e370776f7824a1de217ac85775f6e265d11b4841b09214286ddf3dfc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised WordPress upload directories, suggesting a link farm designed to redirect users. The PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://botosani.ro/img/uploads/file/86875178929.pdf In PDF document text
    • http://dui-antidote.net/images/userfiles/file/xoguv.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9d53363f0---voroteralib.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/78061332494.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b62cc09c2e3---34086107455.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/spe3800qjpomptrstlrdejikq4/liraji.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9d65070c3---17581168759.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad7700a791---zijitopigunuv.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/fugakozapitojufi.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/517603bc2d712e642872c6e25e813757/jojolenilupisa.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096b89f547cd---8422656734.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9c61d219a---83864847069.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/e67ce54579557857f53e44b4f23746a9/guvirol.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/wanubavoriled.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/42074120874.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/vaxobufigukimarazobomoxuk.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/5023443530.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8579tjclm7sn9tqrch86ls58td/viviletubinibugov.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/sivedefamozujizu.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/fiberos.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/mobaxowimuwavi.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/42592281219.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21566ee838---5731442453.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/be42d33937f13e38d9b4fa7bec92446a/53879933991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=nymphs+meaning+in+tamilPDF 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_off00015169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15169 18312 bytes
SHA-256: 98e0a56e50356528bcc4c077a7fd9e6e7d494cc9bb68b21116bfed5f0813271f
font_01_sfnt_off0001809b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1809B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000198b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198B2 10568 bytes
SHA-256: 136979ae185e81178f3d72560bc83d199c4d8874a493ca2af6889babac6f047d