Malicious PDF — malware analysis report

Static analysis result for SHA-256 19149fd9328a7bde…

MALICIOUS

PDF

108.1 KB Created: 2021-07-30 12:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f22f8f0434c7937a5ac6ea380bfccad0 SHA-1: d80fc3912f5af59c6781017c42d1654b35fe9474 SHA-256: 19149fd9328a7bdef215b4909448d611e96799f5bba63389718ad4bee51bcdd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/c0b5a2cf7166964c732498f615754e73/89391247093.pdf In PDF document text
    • http://ashioke.com/images/library/File/xupafiwak.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/79329378040.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/giwemepedopotagori.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/f585103de55416c8aa1c3cb1a160450a/18017655966.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/29c7efb2f4cd4590b9f33d5f0e413c9b/xememi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca8562deb---33927158651.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607569fab80dc---fejajimafatorerijov.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca43c6f5b8---53749024711.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770df973c0c---14769204646.pdfIn PDF document text
    • https://baongochoa.com/upload/file/30515345012.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d28a0a4d28b---nivimomev.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/zapepojedojopiraxo.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607912e44cf88---pomobu.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/69041f382eb7a626f5ae58b582667238/jimeniwurinusuguga.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2c585710f00a97b93d4db76f971c06de/94022837300.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/vimibuxibimewiwi.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///44173102915.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/56644797765.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/68430153753.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/wodabitonob.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88cb13fa35---tevasuriwevo.pdfIn PDF document text
    • http://dztechfin.com/upload/file///supur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+google+scholar+citationsPDF 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_off00014518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14518 10500 bytes
SHA-256: 19f1253eeec3f1a7c19746b9055f0ebb5bef2e95040b3254ea1a9a2f44b7c41a
font_01_sfnt_off00015cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF5 17472 bytes
SHA-256: 475a1bfce6a663d0e0f359008b0451d6bbe19fc38a7dfbfaf6ce5676ebec8027
font_02_sfnt_off00018ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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