Malicious PDF — malware analysis report

Static analysis result for SHA-256 234197d359516d2c…

MALICIOUS

PDF

107.5 KB Created: 2021-07-07 01:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 95b791abfe7f98ec2a4216575a754ab9 SHA-1: 8d44f8149db4a463609c79961d5e40c158ce956c SHA-256: 234197d359516d2c4c9b216cda6eaa5d25e91db94055de1975c0445972c41b13
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 WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of a link farm on potentially compromised hosting suggests an attempt to distribute malware or facilitate phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/cd1d2c1673f7695a8ae6e8717cf24494/25014769968.pdf In PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/46dae0a8fbd4f62c4e74c909aa1a0bb5/bapixaf.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/pumelanetonemedojaru.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f70555435c---sifiwinapugedasanofuvav.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/jg2e5ossohrl09m58edb5a47mr/68191273698.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/40526411801.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc941bca21---17394953183.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/b1tithnorforfij5pkt4rjsj86/76661802228.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085003fbc8e6---10844806110.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/2d8ljmi869cv7jbd71qpt55c4k/35541579013.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/64399464008.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/punapuzi.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/falira.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2d823e8950467e96f94cfd7e12dd40b5/xufewu.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/17ac837bcb5c03c43f866f21d0c8ba0d/romawebu.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/kopugakedojimudilejobaf.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/koxomaxupubifosuluvow.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084b0cb45714---7092857208.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/fokufimovixikovugazosawi.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16232833947421.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/mamasamobafuzabixeruz.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/dimuroroxiberugegogufox.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/pegaxirukuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=haphazard+meaning+in+tamilPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016626.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16626 19496 bytes
SHA-256: ae5950e9fcac0a89b371a0f32cd75b228af32cf8aca771bf09cca42aacffc893
font_00_sfnt_off0000f959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 4404 bytes
SHA-256: 82d60f7f82e5fd3b661769ae433be328e896b7144f6c434c67030e84327c62d2
font_01_sfnt_off000109dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DC 28996 bytes
SHA-256: feb30d5cd91d066f3d2ea7e81d355f6f78d7ce3279203b41d3aa3d3b8affc7b9
font_02_sfnt_off00014e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00018687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18687 10604 bytes
SHA-256: 80cddccd4059a1f9ee348cff1485d9e0e947332bed3b971e27e42070b54b0b7c

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