Malicious PDF — malware analysis report

Static analysis result for SHA-256 910cfa9b3e9965c0…

MALICIOUS

PDF

102.8 KB Created: 2021-09-15 15:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5503f25019bb23b250012d7e6c7bf593 SHA-1: 78a23fdf175f16761240a3496a442ce0635327c8 SHA-256: 910cfa9b3e9965c0e45ece466988b05483af4627b1f3c2cfcb24b0996707a0f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, 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 malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://pistant.ru/uplcv?utm_term=save+data+apk PDF link annotation
    • https://franciscovalles.comtraining.cl/userfiles/files/zodakesebu.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/donepamepawamodalojofese.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141141e6d339---dovixat.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/gukez.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/wibukafalelepekuruxugugu.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210904_095911.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/80036090828.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/sesefi.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161408176e7fc0---27657377946.pdfIn PDF document text
    • http://kebecelectrique.com/upload/editor/file/nufafoniduton.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/5138252480.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/84112517454.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/31638563924.pdfIn PDF document text
    • http://csigikes.hu/admin/fck_upload/file/dumap.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/38399637742.pdfIn PDF document text
    • http://hopkim.vn/upload/files/94215808866.pdfIn PDF document text
    • http://normel.org/files/upload/file/11643070964.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/jukebegagifotabaw.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3dc21821fcb21d47824e6d0df0cb56bc/tisewanumurofidulejezema.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/januxekemiwunagaxab.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/2102146327.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sedobabuvubatobapijamerex.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/joluxuxilinuwowezefoza.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/pinulozabaxerutak.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/jawuzurulin.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sexixorebap.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_off00012b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14350 19868 bytes
SHA-256: 3d41561269638f05749541c9cec466db918058c2aa5efcee3df67455d5e2dd05
font_02_sfnt_off0001775e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1775E 9988 bytes
SHA-256: 5181b7afc4a3010e66cd16ca7c44e3357ea8bb8b19508ee0ea4feb2d8c1fa6c2