Malicious PDF — malware analysis report

Static analysis result for SHA-256 481e8be22e113b00…

MALICIOUS

PDF

86.3 KB Created: 2021-07-17 12:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f69cf5d1804da6439fe10a3393c91d5 SHA-1: bcbd55702b138987d3ccaebbc13c92e6db03d8be SHA-256: 481e8be22e113b0065292a609012511e2bac97325a3e90bffb95fca2cc210a79
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the presence of many suspicious URLs strongly indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://angelofthewinds.net/ckfinder/userfiles/files/99342919085.pdf In PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/fede340bd67f112542417e16c3d5e5a3/69363851496.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/83458bc506fac6bacf0ffe31c51ef05b/liromixexiwixom.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f9bf265ae---65825525464.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/26539130699.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/16194748585.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/semanuvusatanutimif.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16080f61756b93---munobogubazoxuj.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/p90s67gjr7lmjmm3nkpj79hrjv/janufu.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/7214734766e3b4801f4a1334305b8b56/72988559092.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/navadujavovinunoparuxa.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/1b40a9e2d9ba605c0d31e1cd3c601ea0/34711989632.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/popuzogabusozisevesad.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/2arl36kcvo654cn4tpbopfhbsc/10780649226.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/guzisalap.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/nr7hp27mktmfs1atilhr3toqgn/92434609269.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/k9qj6oj25fgbn6d6cgd3lcllsv/tozifepuxaxuxamumagebozas.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f03e91d36---newinipe.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/46368405297.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/50520712433.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/68714630738.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/8mmoumh54cvhbe0fl5i919hb47/85121043432.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/20550635219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=doctors+are+heroes+quotesPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 10332 bytes
SHA-256: 14e22742e360194b17528c89cba50d513c10d2d42bcf76b17fbe1522d85aed81
font_01_sfnt_off00010686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10686 17536 bytes
SHA-256: c6ca22eed4eb1891c92a624a4485973ec304719e89634542a7b9c643844bcb04
font_02_sfnt_off00013443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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