Malicious PDF — malware analysis report

Static analysis result for SHA-256 330582fa140b5137…

MALICIOUS

PDF

69.0 KB Created: 2021-09-18 12:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca59a4428314670cdc2efbde24d08b44 SHA-1: 07b068cf45364bce13b178d4b9b83f3308ff80a8 SHA-256: 330582fa140b5137c9b3c5bb03cc766b0534748b198592790b99497131abc157
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting or compromised WordPress sites, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://chcial.ru/uplcv?utm_term=gta+sa+mod+menu+apk PDF link annotation
    • http://sibzakon.ru/ckfinder/userfiles/files/87773444513.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/49169375946.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/baxazuvanozozirum.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/24073122280.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/soloboravopumexi.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/fajikanokufedasofakipuni.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/87240287736.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///jumumo.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/1902741073.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/49814806145.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/zilonemuwibigez.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/tozumekomonugomamuvag.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/wopewazonalil.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/4m3o7a6gcaljvvnq009vn8u41r/towumipujexewapobolaga.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/90302529106.pdfIn PDF document text
    • http://dongphat.net/upload/files/51810135981.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/porubuxodubugiji.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/g6thjjg086v1fuig8qsq762bv7/lazanosinonosika.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/30632033539.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109040232453684.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/80349643054.pdfIn PDF document text
    • https://eniedu.com/data/file/20210912205205.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614001eb9f5d3---fafugaferedobarokexuji.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/kumijagirebovedifop.pdfIn PDF document text
    • https://geloracinta.com/contents/files/24639637004.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/lolerupaniz.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_off0000b0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E9 15176 bytes
SHA-256: 90b26f2f7e913dbc898496327366efd3628747dc3faca0294b2b5aff829874e0
font_01_sfnt_off0000d671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE88 10548 bytes
SHA-256: 264e7ab29dfbe42f5218e7dddd97c6be60ab49b604ba010e18993defa09b3eeb