Malicious PDF — malware analysis report

Static analysis result for SHA-256 f664428849d7701a…

MALICIOUS

PDF

83.0 KB Created: 2021-08-31 18:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3ca5d44e91f916053dc81a80a21a2c7e SHA-1: 49b9f171565810684b82580fd53fac6f340be568 SHA-256: f664428849d7701adbba296ae79d041350b891eae897bac62a3cde383bee6def
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://queure.ru/uplcv?utm_term=how+to+do+squats+for+a+bigger+bum PDF link annotation
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b14c63ef0---27494968465.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/hku7v1cas5dnl9urie1sdaiadp/64425794814.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/vovixejikizevo.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210703103015.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/34926473862.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e74366daa---31407123868.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/dojimixilemaxonutiti.pdfIn PDF document text
    • https://bor-diing.com/upload/files/53253600269.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/ea1eab3042a8bb7416d4644975f75fcc/86929735680.pdfIn PDF document text
    • http://apsons.eu/files/file/55519870950.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/fefirofane.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4c06ef6ddaf54210d9e8855ab1bbc7ed/feliroru.pdfIn PDF document text
    • http://splogservice.ru/content/file/99270709884.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/bevatozapekokiralenagegig.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/90453726755.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/sixumabotokokat.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/e80bb5ec2dd74f9543bb10bf4f792c7d/rifepupofuzavow.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/31948784508.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/jesoxuwegatebixetiloxun.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bee891c21---wokuwiresurex.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef6d33122---sumuriwosesawurerelitunip.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/42207235541.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/0bcab7ba656d94bf3b0f9b8d88039592/munevopizake.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f23498f8074259e4ac30ccadfa82ac62/14262608510.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/89748766505.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_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 17412 bytes
SHA-256: 64d8c650ad9e6ba2783d48bc2aa845973df5a20beeba405722ce00fa9e21aa8c
font_01_sfnt_off00010bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C4 11012 bytes
SHA-256: 3fda748d821cb65818fba5b0e9d996a3d3fc4110569905e62cab6433b0f6884c