Malicious PDF — malware analysis report

Static analysis result for SHA-256 8153068b6e41ef35…

MALICIOUS

PDF

76.9 KB Created: 2021-09-01 07:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5fe336832fdd4bcc629d46d41bfd8da6 SHA-1: 15fd3b21acc04da332d7aaf46e5e4273e49b72d8 SHA-256: 8153068b6e41ef3509c01d0b852472ea5d70e99aa2569f8e4aa17a11bdd9021c
116 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to redirect users to potentially harmful content, such as phishing pages or malware download sites. No scripts were extracted, but the extensive use of external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=wear+2nd+form+of+verb PDF link annotation
    • http://ascensionchina.com/userfiles/file/23486271281.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/62707954752.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/40039580833.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609138a898c2e---jelekojiw.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/zelawilatazigaxegebi.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16078b99c3582a---90230746479.pdfIn PDF document text
    • https://noventa.cz/media/files/file/68998129807.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160722f924f024---jedolunomudoz.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ne6topb3a6j4golqmeni62evla/vidizoxugusinopuxewurur.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/sinaxavodibave.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/dijukidajikerozikuvez.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d34e197f5---kizobedixuxexeloxakiru.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/mumitomu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6d4632326---97234848117.pdfPDF link annotation
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/emb8brfgild6dd6o1ncv476q56/73865952807.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/174ca3bc54db314a7f2bf37bcecb0b02/21525221472.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/zasukuvexagomivi.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f82ab36cf9---84971318414.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210828205326.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/28148339066.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/sumegilemizatajam.pdfIn PDF document text
    • http://heureka-cz.eu/files/xawovobeni.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ab80c4fc2cb7f6087308cebec43d6910/mofenevavibepefebibopezan.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/khheq6ilqe6tjessmq8grfr7v6/kuwikawizuromefesiseti.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/9bhek66t3pee2648b9jmnkhc60/wexowarisube.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/80199596450.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_off0000c9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CA 10432 bytes
SHA-256: 1ac34b2b31e66b5bf3fd32a932d4aa567d41aa30719f746ee3de55a7f0aca257
font_01_sfnt_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 16960 bytes
SHA-256: 7cb4e91c0480b9699d4fc040fda07e245aada0b9137f5804e13a5cf23ed91854
font_02_sfnt_off00010d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1