Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac21759f79ff5196…

MALICIOUS

PDF

82.1 KB Created: 2021-06-27 07:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8de5c2fb2e921f49d47e06ca0d8febc9 SHA-1: c41decfef6a00176d3f32ab5938ad036c1d004b8 SHA-256: ac21759f79ff5196104eab8f2f5369207228cb8b16e4cce02be4eb373772a680
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting domains, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nemeckystrakac.sk/editor_uploads/files/bozupiwopojanawaja.pdf In PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/dd040f420f322f885e4339d405cf3de4/43788821599.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/f4251f6e434eb87135fb1dad4ac0f11e/78875152509.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/koropizoduxeruzibuzunij.pdfIn PDF document text
    • https://diaspoassur.com/wp-content/plugins/super-forms/uploads/php/files/c281a732119a6319edb0a475fad31359/60314444338.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/70291377718.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/mikozulolafirijuf.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c888437edd---mekanurolemusotikafabawuf.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2cd83d901---gubirilexosinoxexis.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609493900b487---19959387120.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/fajulurufiber.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/b1759c116882488ba686742978307eb8/ruluwovasilijujobap.pdfIn PDF document text
    • https://kildevangen.dk/files/nijutobatowudi.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/gakipeje.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/5904495586.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/76715299292.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff256bb4a8---rizoxejifom.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/39014181010.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076238187768---pemidipijilazugozete.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/22970aba616d1c061d0c922b21d80034/wujutijidafukufakevug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+molecular+nature+of+matter+and+change+5th+edition+pdfPDF 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_off0000c3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 11096 bytes
SHA-256: 9670977ff99225330b5959b94402a9476736a319f9de4035efc73e0244ecb6c4
font_02_sfnt_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 17292 bytes
SHA-256: 9f3f9d1861b71db34907a5983ebb28a3edbaaf654485e930834dbd50f377ad74
font_03_sfnt_off00012272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12272 16084 bytes
SHA-256: a79c9caf7d9fe7d7e6557dd08284a48a0650ee9668136fadcfdab94fba17ddb2

Open this report in the interactive analyzer, or submit your own file for analysis.