Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bf3bfb3729de8f…

MALICIOUS

PDF

74.0 KB Created: 2021-09-17 04:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99ea6c37f32d4cfddbf497b1eedc29f0 SHA-1: 4498051b9fea2e0334fb8e3874d2e47f3edcf4c4 SHA-256: b3bf3bfb3729de8fb985058aaecb9ede79d930794706e505bdf82692536007d6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this phishing or malware distribution intent. The ClamAV detection and ML classifier further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=nds+apk+android PDF link annotation
    • http://a-b-i-s.net/layout/bilder/file/35061225337.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/5702595984.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/46840342279.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/8i2phf2rte5lvlq9r516r3cpi4/penezawuxanikosorobisut.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137d36ee0b84---96058110976.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210905_05981D9EAEFFAF34.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/84812290848.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/48115221135.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109131318202373.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/mimuzirasapavi.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/356981845.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/31781953035.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/19139353533.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/74311437632.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/78011253431.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/rafalepuzitumixamewewe.pdfIn PDF document text
    • http://baove247.org/upload/files/43551641520.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7fbaca7dc9dab656b7343822b5b28ccd/jovuferixokitanadotak.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/patobakisavunuzebiz.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/89766434832.pdfIn PDF document text
    • https://digireg.si/upload/tokegeni.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/jijedaxewonino.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143eaa4b28d2---wozoliduvelikavawig.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/caabf43ca55dcdf1d5ac397fb5b44cf7/6283854544.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/zifutagikizu.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_off0000c04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04E 16724 bytes
SHA-256: bb68a0569855779157a5a249cde30e950cb0fd757efe172d7e5d5ddb79cdd8ab
font_01_sfnt_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 10180 bytes
SHA-256: 367f540640df8f3837d04a4ad550e97d2d3f36c1e94da0b5fd60a9aa5da8484f

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