Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1acaa7a332709d…

MALICIOUS

PDF

133.1 KB Created: 2021-07-28 09:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ee3029abc80eb9a6982899395f014ee SHA-1: b2382d57d7874346e17464c006493e9f9cb354d5 SHA-256: 0f1acaa7a332709d52f472fcb68655bb14078f0b5fe09b08655dbf59284d18c7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9859

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/44f0a8d15a0e6b5d3ee1271560e27c94/38197864255.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/60942a330cbd4681d7d6c1f01e7b9e32/zuluxebidobot.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/liwapesopijusumazonodog.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160821acb51e7c---93097453162.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a07133f22---tebuzexaxum.pdfIn PDF document text
    • http://homeopathyhk.com/files/14730350009.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f3c9c14ed8e0d482985b5a53974d5546/35175060225.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/67081787714.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210702030351_44503507.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/9201ee4b00ae2412f2c4b08a3c06caba/57486697945.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/ddeeb0b3d5681e4381ceee1e12bcbfa7/wobuz.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/soganomoridisuluvakugekew.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/60454181483.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/fikigolalinosinariro.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/4078076143.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/95881877177.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad69250e0d1582726c04eb611b499c4a/senezisominasewel.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/88981166487.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/zupaxamalatimezuluduruz.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/29917271304.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831c37ef41f---sobexije.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/sejebaluke.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8163cbb0ca13add236c9e3606d91ebe5/xenutakesafafekiwudop.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/xifad.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a83d343a19170b5c0e4fa3e1cf2af759/26575530054.pdfIn PDF document text
    • https://loctra.net/userfiles/file/bufenuru.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/ruzuzonusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=yamaha+nvx+155+user+manualPDF 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_off0001a864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A864 17556 bytes
SHA-256: 879516e3dc0543423717e05aebd3a05425f20adc716ea8f95e691007d717a92f
font_01_sfnt_off0001d649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D649 10500 bytes
SHA-256: b286e7072c243f41c7c1c291f71b1fe23044c463842d1179bd6de9ca3e76dcc3
font_02_sfnt_off0001ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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