Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16d8a10a323bbeb…

MALICIOUS

PDF

89.1 KB Created: 2021-06-25 12:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2faf65f1f6e82ac54763fcb58ccced22 SHA-1: 719d1c6695e35a7c0b9aedb066406c301bda7bf9 SHA-256: a16d8a10a323bbebaacfc3d8ca43c2b585d1afc6b1440a88fc73f811625da58e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, many of which are hosted on WordPress installations. The primary purpose appears to be to lure users to these sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/a7b2e43d3a6650e6b0f98b098996a054/xejigaku.pdf In PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/36h0m3tn82fnpo6h80u5hfk883/44714937661.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/16474f49d5885e5e2b109265c8885868/sasoxiwezorokas.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/12905319693.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c7c7c43fe12e6d1b3a3664c7857d2143/dodenefar.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/wogis.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/bgjj923u0183mf96k58df7sus8/nagupot.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/uqbj240taud32kdq96c6u75br5/zoforena.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/pokam.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840f834496b---zakivefadilijowasi.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/eec0ae3214c9f8f3ecd59fb954c4dedf/zarivepitagaxibeboxogi.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c6cc0c6b0---ripumafaxamupon.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c33e775e945---kofigurokigepa.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/vv8de442d3oc402t87qjsh1uuc/51354498001.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c582a65b4---sulovibokujiw.pdfIn PDF document text
    • http://locktactyuma.com/userfiles/file/tivexoralugimixekurubu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c02a9ff30---24676221932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=enagic+sd501+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 10656 bytes
SHA-256: 8464f7b892ae58c677dadec41962135b36c53fcecc61fb9b29909ab6a8a05ee5
font_02_sfnt_off00010ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF7 19372 bytes
SHA-256: cf6e1eb5d257439c4417484fe2c84862de6403da880690903014178f322920e2
font_03_sfnt_off00014211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14211 16120 bytes
SHA-256: 5a58bd25086e93d985c75a25ed67f4dca879ce5f42e3fed3a71b5bf37e4b09db

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