Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa791352c868c97…

MALICIOUS

PDF

90.1 KB Created: 2021-06-27 07:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72ad2339d9bc31076602f7a634720b50 SHA-1: 07514cb81b7714c2214c180bc994031574f99ecd SHA-256: 4fa791352c868c97540e9e2fd95d90075746c7c39a24838abb99eea28dec109c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. These links are likely intended to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=sample+of+asexual+reproduction
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/skdvtp2d2j15h1mtathcjfkgqq/tetezaf.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/8aa1e6bdd138c9176831dffbd867d654/guvav.pdf
    • http://pettwayfamilyreunion.com/clients/39389/File/nuzadoseridi.pdf
    • http://dragoniresorts.com/userfiles/kinavax.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a978f028e---82178418392.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16097b8b5936cd---figebetakodojuwaralasol.pdf
    • http://tokyoracing.hu/userfiles/file/rofopanok.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/821d63011f2c6dc609dd8c07b6f6eee0/sotedujijepadij.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160809aeed6b5c---lasufopev.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/06175a6a810763739b304538660c7c4f/42530867559.pdf
    • http://dgjst.com/upfile/file/58063916654.pdf
    • http://grafiport.com/userfiles/file/mamuwubavitemisotusi.pdf
    • https://africanresearchcenter.com/userfiles/file/xavenus.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b8d9b8cf5---69547105155.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea35151766---fogejodifopasunu.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/5fd99a29ff323a8153b1ac50c98c4aae/ganopodagukeb.pdf
    • http://jnnycc.org/userfiles/file/rezenadid.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e6930ef37---welotufef.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/fpqbl7sjrb3vav4eobdceqqseg/74369810248.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b10f32bc40---96225756121.pdf
    • https://alice-immo.com/userfiles/file/91026969284.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf16c6b598---34116733730.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/grev8ototd1ojvl1dlir4ogmra/vemevefut.pdf
    • http://s292376414.onlinehome.fr/datas/imgmail/file/wifuwu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd01.bin
e34666725da535b8a9ba9fbabfb8be9d43344ac9381eb6a82d9b855865a74697
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD01 17228 bytes
font_01_sfnt_off00012967.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12967 16792 bytes
font_02_sfnt_off0001417e.bin
dff114841e7776da603d287fdd8aa302a2bf7a189b67f49f4d9eece9c4b6045e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1417E 11056 bytes